From 8fef11f172c0fbf4029eab2fb0f7f9a3d1491a61 Mon Sep 17 00:00:00 2001
From: "DESKTOP-G08HS3B\\Lee Yi" <leeyi45@gmail.com>
Date: Mon, 3 Mar 2025 02:07:43 -0500
Subject: [PATCH 01/17] Relocate svmc repl prompt
---
README.md | 1 -
docs/lib/concurrency.js | 32 -
docs/md/README_3_CONCURRENT.md | 62 -
docs/md/README_CONCURRENCY.md | 10 -
docs/md/README_top.md | 4 -
docs/specs/Makefile | 2 +-
docs/specs/source_3_concurrent.tex | 106 -
docs/specs/source_concurrency.tex | 9 -
scripts/docs.mjs | 21 -
src/constants.ts | 1 -
src/createContext.ts | 2 -
src/editors/ace/docTooltip/index.ts | 2 -
src/index.ts | 9 +-
.../preprocessor/__tests__/preprocessor.ts | 2 +-
.../transformers/hoistAndMergeImports.ts | 2 +-
.../__tests__/transformers/removeExports.ts | 2 +-
.../transformProgramToFunctionDeclaration.ts | 2 +-
src/repl/__tests__/main.ts | 20 +
src/repl/__tests__/svmc.ts | 110 +
src/repl/__tests__/transpiler.ts | 66 +
src/repl/__tests__/utils.ts | 38 +
src/repl/index.ts | 13 +-
src/repl/main.ts | 11 +
src/repl/svmc.ts | 106 +
src/repl/transpiler.ts | 108 +-
src/runner/sourceRunner.ts | 56 +-
src/schedulers.ts | 105 -
src/stdlib/inspector.ts | 22 +-
src/transpiler/__tests__/transpiled-code.ts | 2 +-
src/types.ts | 19 +-
src/utils/{testing.ts => testing/index.ts} | 16 +-
src/utils/testing/misc.ts | 27 +
src/utils/{ast => testing}/sanitizer.ts | 0
src/vm/__tests__/svml-machine.ts | 1577 --------------
src/vm/svmc.ts | 231 --
src/vm/svml-machine.ts | 1872 -----------------
36 files changed, 463 insertions(+), 4205 deletions(-)
delete mode 100644 docs/lib/concurrency.js
delete mode 100644 docs/md/README_3_CONCURRENT.md
delete mode 100644 docs/md/README_CONCURRENCY.md
delete mode 100644 docs/specs/source_3_concurrent.tex
delete mode 100644 docs/specs/source_concurrency.tex
create mode 100644 src/repl/__tests__/main.ts
create mode 100644 src/repl/__tests__/svmc.ts
create mode 100644 src/repl/__tests__/transpiler.ts
create mode 100644 src/repl/__tests__/utils.ts
create mode 100644 src/repl/main.ts
create mode 100644 src/repl/svmc.ts
delete mode 100644 src/schedulers.ts
rename src/utils/{testing.ts => testing/index.ts} (96%)
create mode 100644 src/utils/testing/misc.ts
rename src/utils/{ast => testing}/sanitizer.ts (100%)
delete mode 100644 src/vm/__tests__/svml-machine.ts
delete mode 100644 src/vm/svmc.ts
delete mode 100644 src/vm/svml-machine.ts
diff --git a/README.md b/README.md
index 7121fd7d7..55c79f542 100644
--- a/README.md
+++ b/README.md
@@ -81,7 +81,6 @@ Currently, valid CHAPTER/VARIANT combinations are:
- `--chapter=2 --variant=interpreter`
- `--chapter=2 --variant=typed`
- `--chapter=3 --variant=default`
-- `--chapter=3 --variant=concurrent`
- `--chapter=3 --variant=interpreter`
- `--chapter=3 --variant=typed`
- `--chapter=4 --variant=default`
diff --git a/docs/lib/concurrency.js b/docs/lib/concurrency.js
deleted file mode 100644
index 75fa7c269..000000000
--- a/docs/lib/concurrency.js
+++ /dev/null
@@ -1,32 +0,0 @@
-/**
- * Setup multiple threads for concurrent execution. For each
- * function <CODE>f_i</CODE>,
- * setup a thread <CODE>t_i</CODE> that executes the body of
- * <CODE>f_i</CODE>. Any parameters of <CODE>f_i</CODE> refer
- * to <CODE>undefined</CODE> during execution.
- * The thread that called <CODE>concurrent_execute</CODE>
- * runs concurrently with all <CODE>t_i</CODE>. Returns
- * <CODE>undefined</CODE>. This is an atomic operation.
- * @param {function} f_1,f_2,...,f_n - given functions
- * @returns {undefined} undefined
- */
-function concurrent_execute() {}
-
-/**
- * Assumes the head of pair <CODE>p</CODE> is a boolean
- * <CODE>b</CODE>. Sets the head of <CODE>p</CODE> to
- * <CODE>true</CODE>. Returns <CODE>b</CODE>. This is an
- * atomic operation.
- * @param {array} p - given pair
- * @returns {value} - head of pair <CODE>b</CODE>
- */
-function test_and_set(p) {}
-
-/**
- * Sets the head of pair <CODE>p</CODE> to
- * <CODE>false</CODE>. Returns <CODE>undefined</CODE>.
- * This is an atomic operation.
- * @param {array} p - given pair
- * @returns {undefined} undefined
- */
-function clear(p) {}
diff --git a/docs/md/README_3_CONCURRENT.md b/docs/md/README_3_CONCURRENT.md
deleted file mode 100644
index c4147ab00..000000000
--- a/docs/md/README_3_CONCURRENT.md
+++ /dev/null
@@ -1,62 +0,0 @@
-Source §3 Concurrent is a small programming language, designed for the third chapter
-of the textbook
-<a href="https://sourceacademy.org/sicpjs">Structure and Interpretation
-of Computer Programs, JavaScript Adaptation</a> (SICP JS).
-
-## What names are predeclared in Source §3 Concurrent?
-
-On the right, you see all predeclared names of Source §3 Concurrent, in alphabetical
-order. Click on a name to see how it is defined and used. They come in these groups:
- <ul>
- <li>
- <a href="../AUXILIARY/index.html">AUXILIARY</a>: Auxiliary constants and functions
- </li>
- <li>
- <a href="../MISC/index.html">MISC</a>: Miscellaneous constants and functions
- </li>
- <li>
- <a href="../MATH/index.html">MATH</a>: Mathematical constants and functions
- </li>
- <li>
- <a href="../LISTS/index.html">LISTS</a>: Support for lists
- </li>
- <li>
- <a href="../PAIRMUTATORS/index.html">PAIRMUTATORS</a>: Mutating pairs
- </li>
- <li>
- <a href="../ARRAYS/index.html">ARRAYS</a>: Support for arrays
- </li>
- <li>
- <a href="../STREAMS/index.html">STREAMS</a>: Support for streams
- </li>
- <li>
- <a href="../CONCURRENCY/index.html">CONCURRENCY</a>: Support for concurrency
- </li>
- </ul>
-
-## What can you do in Source §3 Concurrent?
-
-You can use all features of
-<a href="../source_3/">Source §3</a> and all
-features that are introduced in
-<a href="https://sourceacademy.org/sicpjs/3.4">chapter 3.4</a> of the
-textbook.
-Below are the features that Source §3 Concurrent adds to Source §3.
-
-### Concurrency
-
-To introduce concurrency into your programs, you can use the
-functions in the <a href="../CONCURRENCY/">CONCURRENCY</a> library. The program
-runs concurrently with the threads that it creates. The program terminates when
-all threads terminate. Any result value from any of the threads, including the
-program's thread, are ignored. Use the predeclared `display` function to display
-result values.
-
-## You want the definitive specs?
-
-For our development team, we are maintaining a definitive description
-of the language, called the
-<a href="../source_3_concurrent.pdf">Specification of Source §3 Concurrent</a>. Feel free to
-take a peek!
-
-
diff --git a/docs/md/README_CONCURRENCY.md b/docs/md/README_CONCURRENCY.md
deleted file mode 100644
index e3a1f28e7..000000000
--- a/docs/md/README_CONCURRENCY.md
+++ /dev/null
@@ -1,10 +0,0 @@
-CONCURRENCY provides three functions for introducing concurrency.
-Click on a name on the right to see how they are defined and used.
-
-Concurrency is covered in
-the textbook
-<a href="https://sourceacademy.org/sicpjs">Structure and Interpretation
-of Computer Programs, JavaScript Adaptation</a> (SICP JS)
-in
-<a href="https://sourceacademy.org/sicpjs/3.4.2">section 3.4.2 Mechanisms for Controlling Concurrency</a>.
-
diff --git a/docs/md/README_top.md b/docs/md/README_top.md
index 33aedac01..17e62e591 100644
--- a/docs/md/README_top.md
+++ b/docs/md/README_top.md
@@ -31,8 +31,6 @@ the members of our learning community.
#### <a href="source_2_typed/">Source §2 Typed</a>
-#### <a href="source_3_concurrent/">Source §3 Concurrent</a>
-
#### <a href="source_3_typed/">Source §3 Typed</a>
#### <a href="source_4_typed/">Source §4 Typed</a>
@@ -58,8 +56,6 @@ the Source Academy.
#### <a href="source_2_typed.pdf">Specification of Source §2 Typed</a>
-#### <a href="source_3_concurrent.pdf">Specification of Source §3 Concurrent</a>
-
#### <a href="source_3_typed.pdf">Specification of Source §3 Typed</a>
#### <a href="source_4_typed.pdf">Specification of Source §4 Typed</a>
diff --git a/docs/specs/Makefile b/docs/specs/Makefile
index 9c90edd42..30cf44087 100644
--- a/docs/specs/Makefile
+++ b/docs/specs/Makefile
@@ -1,6 +1,6 @@
PDFLATEX = latexmk -pdf
-SPECSNUMS = 1 1_wasm 1_type_inference 1_infinite_loop_detection 1_typed 2 2_typed 3_type_inference 3 3_concurrent 3_typed 4 4_explicitcontrol 4_typed styleguide 2_stepper studio_2 python_1
+SPECSNUMS = 1 1_wasm 1_type_inference 1_infinite_loop_detection 1_typed 2 2_typed 3_type_inference 3 3_typed 4 4_explicitcontrol 4_typed styleguide 2_stepper studio_2 python_1
SPECS = $(SPECSNUMS:%=source_%)
diff --git a/docs/specs/source_3_concurrent.tex b/docs/specs/source_3_concurrent.tex
deleted file mode 100644
index 6631becee..000000000
--- a/docs/specs/source_3_concurrent.tex
+++ /dev/null
@@ -1,106 +0,0 @@
-\input source_header.tex
-
-\begin{document}
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
- \docheader{2021}{Source}{\S 3 Concurrent}{Jonathan Chan, Martin Henz, Koo Zhengqun}
- %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
-
-\input source_intro.tex
-
-Source \S 3 Concurrent is a concurrent extension of Source \S 3.
-
-\section{Changes}
-
-Source \S 3 Concurrent modifies Source \S 3 in the following ways:
-\begin{itemize}
-\item Concurrency support functions are added, see Section~\textbf{Concurrency Support} on page \pageref{conc_supp}.
-\item The given program starts in a thread that runs concurrently with any
- threads that are created during the execution of the program.
-\item Neither the thread of the give program nor any other threads produce
- any values as results. Their effect is observable through \emph{side effects}
- such as calls of the \lstinline{display} primitive.
- \item Import directives are currently not supported.
-\end{itemize}
-\noindent
-The concurrency of Source \S 3 Concurrent is thread-based and deviates
-from the event-driven concurrency of
-\href{http://www.ecma-international.org/publications/files/ECMA-ST/Ecma-262.pdf}{\color{DarkBlue}
- ECMAScript 2018 ($9^{\textrm{th}}$ Edition)}. Source \S 3 Concurrent is
-motivated by Section 3.4 of the textbook
-\href{https://sourceacademy.org/sicpjs}{\color{DarkBlue}\emph{Structure and Interpretation
-of Computer Programs}, JavaScript Adaptation}.
-
-\section{Concurrency}
-
-We specify \emph{interleaving semantics} for Source \S 3 Concurrent.
-The effect of executing a Source \S 3 Concurrent program
-should be explainable as a single sequence of atomic actions. Each thread
-specifies a particular sequence of actions in a specific order,
-and the implementation is free to interleave the sequences of the threads
-into a single sequence, as long as the following conditions are met:
-\begin{enumerate}
-\item The order of actions within each thread is respected (sequential
- threads).
-\item Any action that is included in any thread's sequence of actions will
- eventually be executed (no starvation).
-\end{enumerate}
-\noindent
-The atomic actions are primitive steps such as accessing the value of a name,
-accessing a data structure, reducing a conditional expression or statement,
-carrying out a primitive operation or calling a function. Such atomic actions
-are considered \emph{uninterruptible}; they specify the \emph{granularity}
-of the concurrency.
-
-\input source_bnf.tex
-
-\newpage
-
-\input source_3_bnf_without_import.tex
-
-\newpage
-
-\input source_return
-
-\input source_boolean_operators
-
-\input source_loops
-
-\input source_names_lang
-
-\input source_numbers
-
-\input source_strings
-
-\input source_arrays
-
-\input source_comments
-
-\input source_typing_3
-
-\input source_standard
-
-\input source_misc
-
-\input source_math
-
-\input source_concurrency
-
-\input source_lists
-
-\input source_pair_mutators
-
-\input source_array_support
-
-\input source_streams
-
-\input source_js_differences
-
-\newpage
-
-\input source_list_library
-
-\newpage
-
-\input source_stream_library
-
- \end{document}
diff --git a/docs/specs/source_concurrency.tex b/docs/specs/source_concurrency.tex
deleted file mode 100644
index 632810695..000000000
--- a/docs/specs/source_concurrency.tex
+++ /dev/null
@@ -1,9 +0,0 @@
-\subsection*{Concurrency Support}
-\label{conc_supp}
-The following concurrency support is provided:
-
-\begin{itemize}
-\item \(\texttt{concurrent\_execute(}\texttt{f}_\texttt{1}, \cdots \texttt{f}_\texttt{n}\texttt{)}\): \(\textit{primitive}\), setup multiple threads for concurrent execution. For each nullary function \(\texttt{f}_\texttt{i}\) that returns \texttt{undefined}, setup a thread \(\texttt{t}_\texttt{i}\) that executes the code in the body of \(\texttt{f}_\texttt{i}\). The thread that called \texttt{concurrent\_execute} also executes concurrently with all \(\texttt{t}_\texttt{i}\). Returns \texttt{undefined}. This is an atomic operation.
-\item \texttt{test\_and\_set(p)}: \(\textit{primitive}\), assumes the head of pair \texttt{p} is a boolean \(b\). Sets the head of \texttt{p} to \texttt{true}. Returns \(b\). This is an atomic operation.
-\item \texttt{clear(p)}: \(\textit{primitive}\), sets the head of pair \texttt{p} to \texttt{false}. Returns \texttt{undefined}. This is an atomic operation.
-\end{itemize}
diff --git a/scripts/docs.mjs b/scripts/docs.mjs
index 70f0faef0..bd592b606 100644
--- a/scripts/docs.mjs
+++ b/scripts/docs.mjs
@@ -71,20 +71,6 @@ const configs = {
"pairmutator.js"
]
},
- "Source §3 Concurrent": {
- "readme": "README_3_CONCURRENT.md",
- "dst": "source_3_concurrent/",
- "libs": [
- "auxiliary.js",
- "misc.js",
- "math.js",
- "list.js",
- "stream.js",
- "array.js",
- "pairmutator.js",
- "concurrency.js"
- ]
- },
"Source §3 Typed": {
"readme": "README_3_TYPED.md",
"dst": "source_3_typed/",
@@ -190,13 +176,6 @@ const configs = {
"pairmutator.js"
]
},
- "CONCURRENCY": {
- "readme": "README_CONCURRENCY.md",
- "dst": "CONCURRENCY/",
- "libs": [
- "concurrency.js"
- ]
- },
"MCE": {
"readme": "README_MCE.md",
"dst": "MCE/",
diff --git a/src/constants.ts b/src/constants.ts
index 6b04dd92a..00d6e3ed5 100644
--- a/src/constants.ts
+++ b/src/constants.ts
@@ -35,7 +35,6 @@ export const sourceLanguages: Language[] = [
{ chapter: Chapter.SOURCE_2, variant: Variant.TYPED },
{ chapter: Chapter.SOURCE_3, variant: Variant.DEFAULT },
{ chapter: Chapter.SOURCE_3, variant: Variant.TYPED },
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT },
{ chapter: Chapter.SOURCE_4, variant: Variant.DEFAULT },
{ chapter: Chapter.SOURCE_4, variant: Variant.TYPED },
{ chapter: Chapter.SOURCE_4, variant: Variant.EXPLICIT_CONTROL }
diff --git a/src/createContext.ts b/src/createContext.ts
index 705b70dcb..8525471ff 100644
--- a/src/createContext.ts
+++ b/src/createContext.ts
@@ -11,7 +11,6 @@ import {
import { GLOBAL, JSSLANG_PROPERTIES } from './constants'
import { call_with_current_continuation } from './cse-machine/continuations'
import Heap from './cse-machine/heap'
-import { AsyncScheduler } from './schedulers'
import * as list from './stdlib/list'
import { list_to_vector } from './stdlib/list'
import { listPrelude } from './stdlib/list.prelude'
@@ -121,7 +120,6 @@ const createEmptyDebugger = () => ({
it: (function* (): any {
return
})(),
- scheduler: new AsyncScheduler()
}
})
diff --git a/src/editors/ace/docTooltip/index.ts b/src/editors/ace/docTooltip/index.ts
index 5d0667f32..a22685f62 100644
--- a/src/editors/ace/docTooltip/index.ts
+++ b/src/editors/ace/docTooltip/index.ts
@@ -4,7 +4,6 @@ import * as source_1_typed from './source_1_typed.json'
import * as source_2 from './source_2.json'
import * as source_2_typed from './source_2_typed.json'
import * as source_3 from './source_3.json'
-import * as source_3_concurrent from './source_3_concurrent.json'
import * as source_3_typed from './source_3_typed.json'
import * as source_4 from './source_4.json'
import * as source_4_typed from './source_4_typed.json'
@@ -45,7 +44,6 @@ export const SourceDocumentation = {
'2': resolveImportInconsistency(source_2),
'2_typed': resolveImportInconsistency(source_2_typed),
'3': resolveImportInconsistency(source_3),
- '3_concurrent': resolveImportInconsistency(source_3_concurrent),
'3_typed': resolveImportInconsistency(source_3_typed),
'4': resolveImportInconsistency(source_4),
'4_typed': resolveImportInconsistency(source_4_typed),
diff --git a/src/index.ts b/src/index.ts
index 70262b05e..799bfa19b 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -253,12 +253,9 @@ export async function runFilesInContext(
export function resume(result: Result): Finished | ResultError | Promise<Result> {
if (result.status === 'finished' || result.status === 'error') {
return result
- } else if (result.status === 'suspended-cse-eval') {
- const value = resumeEvaluate(result.context)
- return CSEResultPromise(result.context, value)
- } else {
- return result.scheduler.run(result.it, result.context)
- }
+ }
+ const value = resumeEvaluate(result.context)
+ return CSEResultPromise(result.context, value)
}
export function interrupt(context: Context) {
diff --git a/src/modules/preprocessor/__tests__/preprocessor.ts b/src/modules/preprocessor/__tests__/preprocessor.ts
index 5f0baa0af..aa6d5d307 100644
--- a/src/modules/preprocessor/__tests__/preprocessor.ts
+++ b/src/modules/preprocessor/__tests__/preprocessor.ts
@@ -6,7 +6,7 @@ import { mockContext } from '../../../mocks/context'
import { Chapter, type RecursivePartial } from '../../../types'
import { memoizedGetModuleDocsAsync } from '../../loader/loaders'
import preprocessFileImports from '..'
-import { sanitizeAST } from '../../../utils/ast/sanitizer'
+import { sanitizeAST } from '../../../utils/testing/sanitizer'
import { parse } from '../../../parser/parser'
import {
accessExportFunctionName,
diff --git a/src/modules/preprocessor/__tests__/transformers/hoistAndMergeImports.ts b/src/modules/preprocessor/__tests__/transformers/hoistAndMergeImports.ts
index 8bcc29aa8..b86cc64c1 100644
--- a/src/modules/preprocessor/__tests__/transformers/hoistAndMergeImports.ts
+++ b/src/modules/preprocessor/__tests__/transformers/hoistAndMergeImports.ts
@@ -2,7 +2,7 @@ import { mockContext } from '../../../../mocks/context'
import { parse } from '../../../../parser/parser'
import { Chapter } from '../../../../types'
import hoistAndMergeImports from '../../transformers/hoistAndMergeImports'
-import { sanitizeAST } from '../../../../utils/ast/sanitizer'
+import { sanitizeAST } from '../../../../utils/testing/sanitizer'
describe('hoistAndMergeImports', () => {
const assertASTsAreEqual = (actualCode: string, expectedCode: string) => {
diff --git a/src/modules/preprocessor/__tests__/transformers/removeExports.ts b/src/modules/preprocessor/__tests__/transformers/removeExports.ts
index 8e45a5e0e..c53f9fb44 100644
--- a/src/modules/preprocessor/__tests__/transformers/removeExports.ts
+++ b/src/modules/preprocessor/__tests__/transformers/removeExports.ts
@@ -2,7 +2,7 @@ import { mockContext } from '../../../../mocks/context'
import { parse } from '../../../../parser/parser'
import { Chapter, type Context } from '../../../../types'
import removeExports from '../../transformers/removeExports'
-import { sanitizeAST } from '../../../../utils/ast/sanitizer'
+import { sanitizeAST } from '../../../../utils/testing/sanitizer'
type TestCase = [description: string, inputCode: string, expectedCode: string]
diff --git a/src/modules/preprocessor/__tests__/transformers/transformProgramToFunctionDeclaration.ts b/src/modules/preprocessor/__tests__/transformers/transformProgramToFunctionDeclaration.ts
index 5cfb4625a..201b0f26d 100644
--- a/src/modules/preprocessor/__tests__/transformers/transformProgramToFunctionDeclaration.ts
+++ b/src/modules/preprocessor/__tests__/transformers/transformProgramToFunctionDeclaration.ts
@@ -3,7 +3,7 @@ import { parse } from '../../../../parser/parser'
import { defaultExportLookupName } from '../../../../stdlib/localImport.prelude'
import { Chapter } from '../../../../types'
import { transformProgramToFunctionDeclaration } from '../../transformers/transformProgramToFunctionDeclaration'
-import { sanitizeAST } from '../../../../utils/ast/sanitizer'
+import { sanitizeAST } from '../../../../utils/testing/sanitizer'
describe('transformImportedFile', () => {
const currentFileName = '/dir/a.js'
diff --git a/src/repl/__tests__/main.ts b/src/repl/__tests__/main.ts
new file mode 100644
index 000000000..6477a99a0
--- /dev/null
+++ b/src/repl/__tests__/main.ts
@@ -0,0 +1,20 @@
+import type { Command } from 'commander'
+import { getMainCommand } from '../main'
+
+jest.spyOn(process, 'exit').mockImplementation(code => {
+ throw new Error(`process.exit called with ${code}`)
+})
+
+jest.spyOn(process.stdout, 'write').mockImplementation(() => true)
+
+describe('Make sure each subcommand can be run', () => {
+ const mainCommand = getMainCommand()
+ test.each(mainCommand.commands.map(cmd => [cmd.name(), cmd] as [string, Command]))(
+ 'Testing %s command',
+ (_, cmd) => {
+ return expect(cmd.parseAsync(['-h'], { from: 'user' })).rejects.toMatchInlineSnapshot(
+ '[Error: process.exit called with 0]'
+ )
+ }
+ )
+})
\ No newline at end of file
diff --git a/src/repl/__tests__/svmc.ts b/src/repl/__tests__/svmc.ts
new file mode 100644
index 000000000..8ec41b934
--- /dev/null
+++ b/src/repl/__tests__/svmc.ts
@@ -0,0 +1,110 @@
+import { asMockedFunc } from '../../utils/testing/misc'
+import { compileToChoices, getSVMCCommand } from '../svmc'
+import * as vm from '../../vm/svml-compiler'
+import * as fs from 'fs/promises'
+import { INTERNAL_FUNCTIONS } from '../../stdlib/vm.prelude'
+import { expectWritten, getCommandRunner } from './utils'
+
+jest.mock('fs/promises', () => ({
+ writeFile: jest.fn(),
+ readFile: jest.fn()
+}))
+
+const mockedReadFile = asMockedFunc(fs.readFile)
+const mockedWriteFile = asMockedFunc(fs.writeFile)
+
+jest.spyOn(vm, 'compileToIns')
+
+beforeEach(() => {
+ jest.clearAllMocks()
+})
+
+const { expectError: rawExpectError, expectSuccess: rawExpectSuccess } =
+ getCommandRunner(getSVMCCommand)
+
+async function expectSuccess(code: string, ...args: string[]) {
+ mockedReadFile.mockResolvedValueOnce(code)
+
+ await rawExpectSuccess(...args)
+ expect(fs.readFile).toHaveBeenCalledTimes(1)
+ expect(fs.writeFile).toHaveBeenCalledTimes(1)
+}
+
+function expectError(code: string, ...args: string[]) {
+ mockedReadFile.mockResolvedValueOnce(code)
+ return rawExpectError(...args)
+}
+
+test('Running with defaults', async () => {
+ await expectSuccess('1+1;', 'test.js')
+
+ const [[fileName]] = mockedWriteFile.mock.calls
+ expect(fileName).toEqual('test.svm')
+})
+
+it("won't run if the program has parsing errors", async () => {
+ await expectError('1 + 1', '/test.js')
+ expect(vm.compileToIns).toHaveBeenCalledTimes(0)
+ expectWritten(process.stderr.write).toMatchInlineSnapshot(
+ `"Line 1: Missing semicolon at the end of statement"`
+ )
+})
+
+it("won't perform compilation if the output type is 'ast'", async () => {
+ await expectSuccess('1+1;', 'test.js', '-t', 'ast')
+ expect(vm.compileToIns).toHaveBeenCalledTimes(0)
+})
+
+describe('--internals option', () => {
+ test('with valid values', async () => {
+ await expectSuccess('1+1;', 'test.js', '--internals', '["func1", "func2"]')
+ expect(vm.compileToIns).toHaveBeenCalledTimes(1)
+ const [[, , internals]] = asMockedFunc(vm.compileToIns).mock.calls
+
+ expect(internals).toEqual(['func1', 'func2'])
+ })
+
+ test('with non-string values in array', async () => {
+ await expectError('1+1;', 'test.js', '--internals', '[1, 2]')
+ expectWritten(process.stderr.write).toMatchInlineSnapshot(`
+ "error: option '-i, --internals <names>' argument '[1, 2]' is invalid. Expected a JSON array of strings!
+ "
+ `)
+ })
+
+ test('with a non-array', async () => {
+ await expectError('1+1;', 'test.js', '--internals', '{ "a": 1, "b": 2}')
+ expectWritten(process.stderr.write).toMatchInlineSnapshot(`
+ "error: option '-i, --internals <names>' argument '{ \\"a\\": 1, \\"b\\": 2}' is invalid. Expected a JSON array of strings!
+ "
+ `)
+ })
+
+ it('is ignored if variant is concurrent', async () => {
+ await expectSuccess(
+ '1+1;',
+ 'test.js',
+ '--internals',
+ '["func1", "func2"]',
+ '--variant',
+ 'concurrent'
+ )
+
+ expect(vm.compileToIns).toHaveBeenCalledTimes(1)
+ const [[, , internals]] = asMockedFunc(vm.compileToIns).mock.calls
+ const expectedNames = INTERNAL_FUNCTIONS.map(([name]) => name)
+ expect(internals).toEqual(expectedNames)
+ })
+})
+
+describe('Test output options', () => {
+ compileToChoices.forEach(choice => {
+ test(choice, async () => {
+ await expectSuccess('1 + 1;', 'test.js', '-t', choice)
+ const [[fileName, contents]] = mockedWriteFile.mock.calls
+
+ expect((fileName as string).startsWith('test')).toEqual(true)
+ expect(contents).toMatchSnapshot()
+ })
+ })
+})
\ No newline at end of file
diff --git a/src/repl/__tests__/transpiler.ts b/src/repl/__tests__/transpiler.ts
new file mode 100644
index 000000000..34862d6d1
--- /dev/null
+++ b/src/repl/__tests__/transpiler.ts
@@ -0,0 +1,66 @@
+import { asMockedFunc } from '../../utils/testing/misc'
+import { getTranspilerCommand } from '../transpiler'
+import * as fs from 'fs/promises'
+import { expectWritten, getCommandRunner } from './utils'
+
+jest.mock('fs/promises', () => ({
+ readFile: jest.fn(),
+ writeFile: jest.fn()
+}))
+
+beforeEach(() => {
+ jest.clearAllMocks()
+})
+
+const mockedWriteFile = asMockedFunc(fs.writeFile)
+const mockedReadFile = asMockedFunc(fs.readFile)
+const { expectError, expectSuccess } = getCommandRunner(getTranspilerCommand)
+
+test('Nothing should be written if the program has parser errors', async () => {
+ mockedReadFile.mockResolvedValueOnce('1+1')
+ await expectError('/test.js')
+ expect(fs.writeFile).toHaveBeenCalledTimes(0)
+
+ expectWritten(process.stderr.write).toMatchInlineSnapshot(
+ `"[/test.js] Line 1: Missing semicolon at the end of statement"`
+ )
+})
+
+test('Nothing should be written if the program has transpiler errors', async () => {
+ mockedReadFile.mockResolvedValueOnce('a;')
+ await expectError('/test.js')
+ expect(fs.writeFile).toHaveBeenCalledTimes(0)
+
+ expectWritten(process.stderr.write).toMatchInlineSnapshot(
+ `"[/test.js] Line 1: Name a not declared."`
+ )
+})
+
+test('Nothing should be written to disk if no output file was specified', async () => {
+ mockedReadFile.mockResolvedValueOnce('1+1;')
+ await expectSuccess('test.js')
+ expect(fs.writeFile).toHaveBeenCalledTimes(0)
+
+ // Code should have been written to stdout
+ expectWritten(process.stdout.write).toMatchSnapshot()
+})
+
+test('Writing to file', async () => {
+ mockedReadFile.mockResolvedValueOnce('1+1;')
+ await expectSuccess('test.js', '-o', 'out.js')
+ expect(fs.writeFile).toHaveBeenCalledTimes(1)
+
+ const [[fileName, contents]] = mockedWriteFile.mock.calls
+ expect(fileName).toEqual('out.js')
+ expect(contents).toMatchSnapshot()
+})
+
+test('pretranspile option', async () => {
+ mockedReadFile.mockResolvedValueOnce('1+1;')
+ await expectSuccess('test.js', '-o', 'out.js', '-p')
+ expect(fs.writeFile).toHaveBeenCalledTimes(1)
+
+ const [[fileName, contents]] = mockedWriteFile.mock.calls
+ expect(fileName).toEqual('out.js')
+ expect(contents).toEqual('1 + 1;\n')
+})
\ No newline at end of file
diff --git a/src/repl/__tests__/utils.ts b/src/repl/__tests__/utils.ts
new file mode 100644
index 000000000..5cc73689e
--- /dev/null
+++ b/src/repl/__tests__/utils.ts
@@ -0,0 +1,38 @@
+import type { Command } from '@commander-js/extra-typings'
+import { asMockedFunc } from '../../utils/testing/misc'
+
+/**
+ * Set up the environment for testing the given command. Returns
+ * `expectSuccess` and `expectError` for use with making assertions
+ * about the behaviour of the command
+ */
+export function getCommandRunner<T extends Command<any, any>>(getter: () => T) {
+ jest.spyOn(process.stdout, 'write').mockImplementation(() => true)
+ jest.spyOn(process.stderr, 'write').mockImplementation(() => true)
+ jest.spyOn(process, 'exit').mockImplementation(code => {
+ throw new Error(`process.exit called with ${code}`)
+ })
+
+ async function runner(...args: string[]) {
+ await getter().parseAsync(args, { from: 'user' })
+ }
+
+ return {
+ expectError(...args: string[]) {
+ // Error conditions should always cause commands to call
+ // process.exit(1)
+ return expect(runner(...args)).rejects.toMatchInlineSnapshot(
+ `[Error: process.exit called with 1]`
+ )
+ },
+ expectSuccess(...args: string[]) {
+ return expect(runner(...args)).resolves.toBeUndefined()
+ }
+ }
+}
+
+export function expectWritten(f: (contents: string) => any) {
+ expect(f).toHaveBeenCalledTimes(1)
+ const [[contents]] = asMockedFunc(f).mock.calls
+ return expect(contents)
+}
\ No newline at end of file
diff --git a/src/repl/index.ts b/src/repl/index.ts
index 72065bc95..14c3f211a 100644
--- a/src/repl/index.ts
+++ b/src/repl/index.ts
@@ -1,11 +1,4 @@
-#!/usr/bin/env node
+#!/bin/env/node
+import { getMainCommand } from './main'
-import { Command } from '@commander-js/extra-typings'
-
-import { getReplCommand } from './repl'
-import { transpilerCommand } from './transpiler'
-
-new Command()
- .addCommand(transpilerCommand)
- .addCommand(getReplCommand(), { isDefault: true })
- .parseAsync()
+getMainCommand().parseAsync()
\ No newline at end of file
diff --git a/src/repl/main.ts b/src/repl/main.ts
new file mode 100644
index 000000000..3bfcbdf80
--- /dev/null
+++ b/src/repl/main.ts
@@ -0,0 +1,11 @@
+import { Command } from '@commander-js/extra-typings'
+
+import { getSVMCCommand } from './svmc'
+import { getReplCommand } from './repl'
+import { getTranspilerCommand } from './transpiler'
+
+export const getMainCommand = () =>
+ new Command()
+ .addCommand(getSVMCCommand())
+ .addCommand(getTranspilerCommand())
+ .addCommand(getReplCommand(), { isDefault: true })
\ No newline at end of file
diff --git a/src/repl/svmc.ts b/src/repl/svmc.ts
new file mode 100644
index 000000000..e285a01cf
--- /dev/null
+++ b/src/repl/svmc.ts
@@ -0,0 +1,106 @@
+import type pathlib from 'path'
+import type fslib from 'fs/promises'
+
+import { Command, InvalidArgumentError, Option } from '@commander-js/extra-typings'
+import { createEmptyContext } from '../createContext'
+import { parse } from '../parser/parser'
+import { Chapter, Variant } from '../types'
+import { stripIndent } from '../utils/formatters'
+import { parseError } from '..'
+import { assemble } from '../vm/svml-assembler'
+import { compileToIns } from '../vm/svml-compiler'
+import { stringifyProgram } from '../vm/util'
+import { chapterParser, getChapterOption } from './utils'
+
+export const compileToChoices = ['ast', 'binary', 'debug', 'json'] as const
+
+export const getSVMCCommand = () =>
+ new Command('svmc')
+ .argument('<inputFile>', 'File to read code from')
+ .addOption(getChapterOption(Chapter.SOURCE_3, chapterParser))
+ .addOption(
+ new Option(
+ '-t, --compileTo <compileOption>',
+ stripIndent`
+ json: Compile only, but don't assemble.
+ binary: Compile and assemble.
+ debug: Compile and pretty-print the compiler output. For debugging the compiler.
+ ast: Parse and pretty-print the AST. For debugging the parser.`
+ )
+ .choices(compileToChoices)
+ .default('binary' as (typeof compileToChoices)[number])
+ )
+ .option(
+ '-o, --out <outFile>',
+ stripIndent`
+ Sets the output filename.
+ Defaults to the input filename, minus any file extension, plus '.svm'.
+ `
+ )
+ .addOption(
+ new Option(
+ '-i, --internals <names>',
+ `Sets the list of VM-internal functions. The argument should be a JSON array of
+strings containing the names of the VM-internal functions.`
+ )
+ .argParser(value => {
+ const parsed = JSON.parse(value)
+ if (!Array.isArray(parsed)) {
+ throw new InvalidArgumentError('Expected a JSON array of strings!')
+ }
+
+ for (const each of parsed) {
+ if (typeof each !== 'string') {
+ throw new InvalidArgumentError('Expected a JSON array of strings!')
+ }
+ }
+ return parsed as string[]
+ })
+ .default([] as string[])
+ )
+ .action(async (inputFile, opts) => {
+ const fs: typeof fslib = require('fs/promises')
+ const vmInternalFunctions = opts.internals || []
+
+ const source = await fs.readFile(inputFile, 'utf-8')
+ const context = createEmptyContext(opts.chapter, Variant.DEFAULT, [], null)
+ const program = parse(source, context)
+ if (program === null) {
+ process.stderr.write(parseError(context.errors))
+ process.exit(1)
+ }
+
+ let output: string | Uint8Array
+ let ext: string
+
+ if (opts.compileTo === 'ast') {
+ output = JSON.stringify(program, undefined, 2)
+ ext = '.json'
+ } else {
+ const compiled = compileToIns(program, undefined, vmInternalFunctions)
+ switch (opts.compileTo) {
+ case 'debug': {
+ output = stringifyProgram(compiled).trimEnd()
+ ext = '.svm'
+ break
+ }
+ case 'json': {
+ output = JSON.stringify(compiled)
+ ext = '.json'
+ break
+ }
+ case 'binary': {
+ output = assemble(compiled)
+ ext = '.svm'
+ break
+ }
+ }
+ }
+
+ const { extname, basename }: typeof pathlib = require('path')
+ const extToRemove = extname(inputFile)
+
+ const outputFileName = opts.out ?? `${basename(inputFile, extToRemove)}${ext}`
+ await fs.writeFile(outputFileName, output)
+ console.log(`Output written to ${outputFileName}`)
+ })
\ No newline at end of file
diff --git a/src/repl/transpiler.ts b/src/repl/transpiler.ts
index 0f4884d1c..3ab8c9708 100644
--- a/src/repl/transpiler.ts
+++ b/src/repl/transpiler.ts
@@ -16,63 +16,63 @@ import {
validateChapterAndVariantCombo
} from './utils'
-export const transpilerCommand = new Command('transpiler')
- .addOption(getVariantOption(Variant.DEFAULT, [Variant.DEFAULT, Variant.NATIVE]))
- .addOption(getChapterOption(Chapter.SOURCE_4, chapterParser))
- .option(
- '-p, --pretranspile',
- "only pretranspile (e.g. GPU -> Source) and don't perform Source -> JS transpilation"
- )
- .option('-o, --out <outFile>', 'Specify a file to write to')
- .argument('<filename>')
- .action(async (fileName, opts) => {
- if (!validateChapterAndVariantCombo(opts)) {
- console.log('Invalid language combination!')
- return
- }
-
- const fs: typeof fslib = require('fs/promises')
- const context = createContext(opts.chapter, opts.variant)
- const entrypointFilePath = resolve(fileName)
-
- const linkerResult = await parseProgramsAndConstructImportGraph(
- async p => {
- try {
- const text = await fs.readFile(p, 'utf-8')
- return text
- } catch (error) {
- if (error.code === 'ENOENT') return undefined
- throw error
- }
- },
- entrypointFilePath,
- context,
- {},
- true
+export const getTranspilerCommand = () =>
+ new Command('transpiler')
+ .addOption(getVariantOption(Variant.DEFAULT, [Variant.DEFAULT, Variant.NATIVE]))
+ .addOption(getChapterOption(Chapter.SOURCE_4, chapterParser))
+ .option(
+ '-p, --pretranspile',
+ "only pretranspile and don't perform Source -> JS transpilation"
)
+ .option('-o, --out <outFile>', 'Specify a file to write to')
+ .argument('<filename>')
+ .action(async (fileName, opts) => {
+ if (!validateChapterAndVariantCombo(opts)) {
+ console.log('Invalid language combination!')
+ return
+ }
- if (!linkerResult.ok) {
- console.log(parseError(context.errors, linkerResult.verboseErrors))
- return
- }
+ const fs: typeof fslib = require('fs/promises')
+ const context = createContext(opts.chapter, opts.variant)
+ const entrypointFilePath = resolve(fileName)
- const { programs, topoOrder } = linkerResult
- const bundledProgram = defaultBundler(programs, entrypointFilePath, topoOrder, context)
+ const linkerResult = await parseProgramsAndConstructImportGraph(
+ async p => {
+ try {
+ const text = await fs.readFile(p, 'utf-8')
+ return text
+ } catch (error) {
+ if (error.code === 'ENOENT') return undefined
+ throw error
+ }
+ },
+ entrypointFilePath,
+ context,
+ {},
+ true
+ )
- const transpiled = opts.pretranspile
- ? generate(bundledProgram)
- : transpile(bundledProgram, context).transpiled
+ if (!linkerResult.ok) {
+ process.stderr.write(parseError(context.errors, linkerResult.verboseErrors))
+ process.exit(1)
+ }
- if (context.errors.length > 0) {
- console.log(parseError(context.errors, linkerResult.verboseErrors))
- return
- }
+ const { programs, topoOrder } = linkerResult
+ const bundledProgram = defaultBundler(programs, entrypointFilePath, topoOrder, context)
- if (opts.out) {
- const resolvedOut = resolve(opts.out)
- await fs.writeFile(resolvedOut, transpiled)
- console.log(`Code written to ${resolvedOut}`)
- } else {
- console.log(transpiled)
- }
- })
+ try {
+ const transpiled = opts.pretranspile
+ ? generate(bundledProgram)
+ : transpile(bundledProgram, context).transpiled
+
+ if (opts.out) {
+ await fs.writeFile(opts.out, transpiled)
+ console.log(`Code written to ${opts.out}`)
+ } else {
+ process.stdout.write(transpiled)
+ }
+ } catch (error) {
+ process.stderr.write(parseError([error], linkerResult.verboseErrors))
+ process.exit(1)
+ }
+ })
diff --git a/src/runner/sourceRunner.ts b/src/runner/sourceRunner.ts
index e2e91befe..3795a3d1e 100644
--- a/src/runner/sourceRunner.ts
+++ b/src/runner/sourceRunner.ts
@@ -3,19 +3,17 @@ import * as _ from 'lodash'
import type { RawSourceMap } from 'source-map'
import { type IOptions, type Result } from '..'
-import { JSSLANG_PROPERTIES, UNKNOWN_LOCATION } from '../constants'
+import { JSSLANG_PROPERTIES } from '../constants'
import { CSEResultPromise, evaluate as CSEvaluate } from '../cse-machine/interpreter'
import { ExceptionError } from '../errors/errors'
import { RuntimeSourceError } from '../errors/runtimeSourceError'
import { TimeoutError } from '../errors/timeoutErrors'
import { isPotentialInfiniteLoop } from '../infiniteLoops/errors'
import { testForInfiniteLoop } from '../infiniteLoops/runtime'
-import { evaluateProgram as evaluate } from '../interpreter/interpreter'
import preprocessFileImports from '../modules/preprocessor'
import { defaultAnalysisOptions } from '../modules/preprocessor/analyzer'
import { defaultLinkerOptions } from '../modules/preprocessor/linker'
import { parse } from '../parser/parser'
-import { AsyncScheduler, PreemptiveScheduler } from '../schedulers'
import {
callee,
getEvaluationSteps,
@@ -25,12 +23,11 @@ import {
} from '../stepper/stepper'
import { sandboxedEval } from '../transpiler/evalContainer'
import { transpile } from '../transpiler/transpiler'
-import { Chapter, type Context, type RecursivePartial, type Scheduler, Variant } from '../types'
+import { Chapter, type Context, type RecursivePartial, Variant } from '../types'
import { validateAndAnnotate } from '../validator/validator'
-import { compileForConcurrent } from '../vm/svml-compiler'
-import { runWithProgram } from '../vm/svml-machine'
import type { FileGetter } from '../modules/moduleTypes'
import { mapResult } from '../alt-langs/mapper'
+import assert from '../utils/assert'
import { toSourceError } from './errors'
import { fullJSRunner } from './fullJSRunner'
import { determineExecutionMethod, determineVariant, resolvedErrorPromise } from './utils'
@@ -60,29 +57,6 @@ let previousCode: {
} | null = null
let isPreviousCodeTimeoutError = false
-function runConcurrent(program: es.Program, context: Context, options: IOptions): Promise<Result> {
- if (context.shouldIncreaseEvaluationTimeout) {
- context.nativeStorage.maxExecTime *= JSSLANG_PROPERTIES.factorToIncreaseBy
- } else {
- context.nativeStorage.maxExecTime = options.originalMaxExecTime
- }
-
- try {
- return Promise.resolve({
- status: 'finished',
- context,
- value: runWithProgram(compileForConcurrent(program, context), context)
- })
- } catch (error) {
- if (error instanceof RuntimeSourceError || error instanceof ExceptionError) {
- context.errors.push(error) // use ExceptionErrors for non Source Errors
- return resolvedErrorPromise
- }
- context.errors.push(new ExceptionError(error, UNKNOWN_LOCATION))
- return resolvedErrorPromise
- }
-}
-
function runSubstitution(
program: es.Program,
context: Context,
@@ -110,17 +84,6 @@ function runSubstitution(
})
}
-function runInterpreter(program: es.Program, context: Context, options: IOptions): Promise<Result> {
- let it = evaluate(program, context)
- let scheduler: Scheduler
- if (options.scheduler === 'async') {
- scheduler = new AsyncScheduler()
- } else {
- scheduler = new PreemptiveScheduler(options.steps)
- }
- return scheduler.run(it, context)
-}
-
async function runNative(
program: es.Program,
context: Context,
@@ -226,10 +189,6 @@ async function sourceRunner(
return resolvedErrorPromise
}
- if (context.variant === Variant.CONCURRENT) {
- return runConcurrent(program, context, theOptions)
- }
-
if (theOptions.useSubst) {
return runSubstitution(program, context, theOptions)
}
@@ -238,7 +197,7 @@ async function sourceRunner(
// native, don't evaluate prelude
if (context.executionMethod === 'native' && context.variant === Variant.NATIVE) {
- return await fullJSRunner(program, context, theOptions.importOptions)
+ return fullJSRunner(program, context, theOptions.importOptions)
}
// All runners after this point evaluate the prelude.
@@ -264,11 +223,8 @@ async function sourceRunner(
return runCSEMachine(program, context, theOptions)
}
- if (context.executionMethod === 'native') {
- return runNative(program, context, theOptions)
- }
-
- return runInterpreter(program, context, theOptions)
+ assert(context.executionMethod !== 'auto', 'Execution method should have been properly determined!')
+ return runNative(program, context, theOptions)
}
/**
diff --git a/src/schedulers.ts b/src/schedulers.ts
deleted file mode 100644
index 94a521f7c..000000000
--- a/src/schedulers.ts
+++ /dev/null
@@ -1,105 +0,0 @@
-/* tslint:disable:max-classes-per-file */
-import { MaximumStackLimitExceeded } from './errors/errors'
-import { saveState } from './stdlib/inspector'
-import { Context, Result, Scheduler, Value } from './types'
-
-export class AsyncScheduler implements Scheduler {
- public run(it: IterableIterator<Value>, context: Context): Promise<Result> {
- return new Promise((resolve, _reject) => {
- context.runtime.isRunning = true
- let itValue = it.next()
- try {
- while (!itValue.done) {
- itValue = it.next()
- if (context.runtime.break) {
- saveState(context, it, this)
- itValue.done = true
- }
- }
- } catch (e) {
- resolve({ status: 'error' })
- } finally {
- context.runtime.isRunning = false
- }
- if (context.runtime.break) {
- resolve({
- status: 'suspended',
- it,
- scheduler: this,
- context
- })
- } else {
- resolve({ status: 'finished', context, value: itValue.value })
- }
- })
- }
-}
-
-export class PreemptiveScheduler implements Scheduler {
- constructor(public steps: number) {}
-
- public run(it: IterableIterator<Value>, context: Context): Promise<Result> {
- return new Promise((resolve, _reject) => {
- context.runtime.isRunning = true
- // This is used in the evaluation of the REPL during a paused state.
- // The debugger is turned off while the code evaluates just above the debugger statement.
- let actuallyBreak: boolean = false
- let itValue = it.next()
- const interval = setInterval(() => {
- let step = 0
- try {
- while (!itValue.done && step < this.steps) {
- step++
- itValue = it.next()
-
- actuallyBreak = context.runtime.break && context.runtime.debuggerOn
- if (actuallyBreak) {
- itValue.done = true
- }
- }
- saveState(context, it, this)
- } catch (e) {
- checkForStackOverflow(e, context)
- context.runtime.isRunning = false
- clearInterval(interval)
- resolve({ status: 'error' })
- }
- if (itValue.done) {
- context.runtime.isRunning = false
- clearInterval(interval)
- if (actuallyBreak) {
- resolve({
- status: 'suspended',
- it,
- scheduler: this,
- context
- })
- } else {
- resolve({ status: 'finished', context, value: itValue.value })
- }
- }
- })
- })
- }
-}
-
-/* Checks if the error is a stackoverflow error, and captures it in the
- context if this is the case */
-function checkForStackOverflow(error: any, context: Context) {
- if (/Maximum call stack/.test(error.toString())) {
- const environments = context.runtime.environments
- const stacks: any = []
- let counter = 0
- for (
- let i = 0;
- counter < MaximumStackLimitExceeded.MAX_CALLS_TO_SHOW && i < environments.length;
- i++
- ) {
- if (environments[i].callExpression) {
- stacks.unshift(environments[i].callExpression)
- counter++
- }
- }
- context.errors.push(new MaximumStackLimitExceeded(context.runtime.nodes[0], stacks))
- }
-}
diff --git a/src/stdlib/inspector.ts b/src/stdlib/inspector.ts
index 85a6fecb3..8eeeea12f 100644
--- a/src/stdlib/inspector.ts
+++ b/src/stdlib/inspector.ts
@@ -1,29 +1,9 @@
-import { Context, Result } from '..'
-import { Node, Scheduler, Value } from '../types'
-
-export const saveState = (
- context: Context,
- it: IterableIterator<Value>,
- scheduler: Scheduler
-): void => {
- context.debugger.state.it = it
- context.debugger.state.scheduler = scheduler
-}
+import type { Context, Node } from '../types'
export const setBreakpointAtLine = (lines: string[]): void => {
breakpoints = lines
}
-export const manualToggleDebugger = (context: Context): Result => {
- context.runtime.break = true
- return {
- status: 'suspended',
- scheduler: context.debugger.state.scheduler,
- it: context.debugger.state.it,
- context
- }
-}
-
let breakpoints: string[] = []
let moved: boolean = true
let prevStoppedLine: number = -1
diff --git a/src/transpiler/__tests__/transpiled-code.ts b/src/transpiler/__tests__/transpiled-code.ts
index 5b54c21cb..52688a80b 100644
--- a/src/transpiler/__tests__/transpiled-code.ts
+++ b/src/transpiler/__tests__/transpiled-code.ts
@@ -2,7 +2,7 @@ import { mockContext } from '../../mocks/context'
import { parse } from '../../parser/parser'
import { Chapter } from '../../types'
import * as ast from '../../utils/ast/astCreator'
-import { sanitizeAST } from '../../utils/ast/sanitizer'
+import { sanitizeAST } from '../../utils/testing/sanitizer'
import { stripIndent } from '../../utils/formatters'
import { transformImportDeclarations, transpile } from '../transpiler'
diff --git a/src/types.ts b/src/types.ts
index 81456b691..b68dcd46b 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -64,7 +64,7 @@ export interface Comment {
loc: SourceLocation | undefined
}
-export type ExecutionMethod = 'native' | 'interpreter' | 'auto' | 'cse-machine'
+export type ExecutionMethod = 'native' | 'auto' | 'cse-machine'
export enum Chapter {
SOURCE_1 = 1,
@@ -94,7 +94,6 @@ export enum Variant {
TYPED = 'typed',
NATIVE = 'native',
WASM = 'wasm',
- CONCURRENT = 'concurrent',
EXPLICIT_CONTROL = 'explicit-control'
}
@@ -168,7 +167,6 @@ export interface Context<T = any> {
status: boolean
state: {
it: IterableIterator<T>
- scheduler: Scheduler
}
}
@@ -274,23 +272,12 @@ export interface Finished {
// field instead
}
-export interface Suspended {
- status: 'suspended'
- it: IterableIterator<Value>
- scheduler: Scheduler
- context: Context
-}
-
export interface SuspendedCseEval {
status: 'suspended-cse-eval'
context: Context
}
-export type Result = Suspended | Finished | Error | SuspendedCseEval
-
-export interface Scheduler {
- run(it: IterableIterator<Value>, context: Context): Promise<Result>
-}
+export type Result = Finished | Error | SuspendedCseEval
/**
* StatementSequence : A sequence of statements not surrounded by braces.
@@ -510,3 +497,5 @@ export type RecursivePartial<T> = T extends Array<any>
[K in keyof T]: RecursivePartial<T[K]>
}>
: T
+
+export type NodeTypeToNode<T extends Node['type']> = Extract<Node, { type: T }>
\ No newline at end of file
diff --git a/src/utils/testing.ts b/src/utils/testing/index.ts
similarity index 96%
rename from src/utils/testing.ts
rename to src/utils/testing/index.ts
index f26de4bdc..d8ef83972 100644
--- a/src/utils/testing.ts
+++ b/src/utils/testing/index.ts
@@ -1,11 +1,11 @@
import type { MockedFunction } from 'jest-mock'
-import createContext, { defineBuiltin } from '../createContext'
-import { parseError, Result, runInContext } from '../index'
-import { mockContext } from '../mocks/context'
-import { ImportOptions } from '../modules/moduleTypes'
-import { parse } from '../parser/parser'
-import { transpile } from '../transpiler/transpiler'
+import createContext, { defineBuiltin } from '../../createContext'
+import { parseError, Result, runInContext } from '../../'
+import { mockContext } from '../../mocks/context'
+import type { ImportOptions } from '../../modules/moduleTypes'
+import { parse } from '../../parser/parser'
+import { transpile } from '../../transpiler/transpiler'
import {
Chapter,
Context,
@@ -14,8 +14,8 @@ import {
Value,
Variant,
type Finished
-} from '../types'
-import { stringify } from './stringify'
+} from '../../types'
+import { stringify } from '../stringify'
export interface CodeSnippetTestCase {
name: string
diff --git a/src/utils/testing/misc.ts b/src/utils/testing/misc.ts
new file mode 100644
index 000000000..4ca9fc519
--- /dev/null
+++ b/src/utils/testing/misc.ts
@@ -0,0 +1,27 @@
+import type { MockedFunction } from 'jest-mock'
+import type { Result } from '../..'
+import type { Finished, Value, Node, NodeTypeToNode } from '../../types'
+
+export function asMockedFunc<T extends (...args: any[]) => any>(func: T) {
+ return func as MockedFunction<T>
+}
+
+export function expectTrue(cond: boolean): asserts cond {
+ expect(cond).toEqual(true)
+}
+
+export function expectFinishedResult(result: Result): asserts result is Finished {
+ expect(result.status).toEqual('finished')
+}
+
+export function expectFinishedResultValue(result: Result, value: Value) {
+ expectFinishedResult(result)
+ expect(result.value).toEqual(value)
+}
+
+export function expectNodeType<T extends Node['type']>(
+ typeStr: T,
+ node: Node
+): asserts node is NodeTypeToNode<T> {
+ expect(node.type).toEqual(typeStr)
+}
\ No newline at end of file
diff --git a/src/utils/ast/sanitizer.ts b/src/utils/testing/sanitizer.ts
similarity index 100%
rename from src/utils/ast/sanitizer.ts
rename to src/utils/testing/sanitizer.ts
diff --git a/src/vm/__tests__/svml-machine.ts b/src/vm/__tests__/svml-machine.ts
deleted file mode 100644
index 8d94829b9..000000000
--- a/src/vm/__tests__/svml-machine.ts
+++ /dev/null
@@ -1,1577 +0,0 @@
-import { Chapter, Variant } from '../../types'
-import { stripIndent } from '../../utils/formatters'
-import {
- expectDisplayResult,
- expectParsedError,
- expectResult,
- expectVisualiseListResult,
- getDisplayResult,
- snapshotSuccess
-} from '../../utils/testing'
-
-// concurrent programs return undefined so use display
-// for tests instead
-// all tests assumes display works
-// comments mention additional opcodes tested by test code
-describe('standard opcodes', () => {
- test('LGCI works', () => {
- return expectDisplayResult(`display(123);`, {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "123",
- ]
- `)
- })
-
- test('LGCF64 works', () => {
- return expectDisplayResult(`display(1.5);`, {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "1.5",
- ]
- `)
- })
-
- test('LGCB0 works', () => {
- return expectDisplayResult(`display(false);`, {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "false",
- ]
- `)
- })
-
- test('LGCB1 works', () => {
- return expectDisplayResult(`display(true);`, {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "true",
- ]
- `)
- })
-
- test('LGCU works', () => {
- return expectDisplayResult(`display(undefined);`, {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "undefined",
- ]
- `)
- })
-
- test('LGCN works', () => {
- return expectDisplayResult(`display(null);`, {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "null",
- ]
- `)
- })
-
- test('LGCS works', () => {
- return expectDisplayResult(`display("test string");`, {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "\\"test string\\"",
- ]
- `)
- })
-
- test('ADDG works for numbers', () => {
- return expectDisplayResult('display(-1+1);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "0",
- ]
- `)
- })
-
- test('ADDG works for strings', () => {
- return expectDisplayResult('display("first"+"second");', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "\\"firstsecond\\"",
- ]
- `)
- })
-
- test('ADDG fails for ill-typed operands', () => {
- return expectParsedError('1+undefined;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected string and string or number and number, got number and undefined for +."`
- )
- })
-
- test('SUBG works for numbers', () => {
- return expectDisplayResult('display(123-124);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "-1",
- ]
- `)
- })
-
- test('SUBG fails for ill-typed operands', () => {
- return expectParsedError('1-undefined;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected number and number, got number and undefined for -."`
- )
- })
-
- test('MULG works for numbers', () => {
- return expectDisplayResult('display(123*2);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "246",
- ]
- `)
- })
-
- test('MULG fails for ill-typed operands', () => {
- return expectParsedError('1*undefined;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected number and number, got number and undefined for *."`
- )
- })
-
- test('DIVG works for numbers', () => {
- return expectDisplayResult('display(128/32);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "4",
- ]
- `)
- })
-
- test('DIVG fails for division by 0', () => {
- return expectParsedError('128/0;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`"Error: execution aborted: division by 0"`)
- })
-
- test('DIVG fails for ill-typed operands', () => {
- return expectParsedError('1/undefined;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected number and number, got number and undefined for /."`
- )
- })
-
- test('MODG works for numbers', () => {
- return expectDisplayResult('display(128%31);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "4",
- ]
- `)
- })
-
- test('MODG fails for ill-typed operands', () => {
- return expectParsedError('1%undefined;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected undefined, got undefined for undefined."`
- )
- })
-
- test('NEGG works', () => {
- return expectDisplayResult('display(-1);display(-(-1));', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "-1",
- "1",
- ]
- `)
- })
-
- test('NEGG fails for ill-typed operands', () => {
- return expectParsedError('-"hi";', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`"Error: execution aborted: Expected number, got string for -."`)
- })
-
- test('NOTG works', () => {
- return expectDisplayResult('display(!false);display(!true);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "true",
- "false",
- ]
- `)
- })
-
- test('NOTG fails for ill-typed operands', () => {
- return expectParsedError('!1;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`"Error: execution aborted: Expected boolean, got number for !."`)
- })
-
- test('LTG works for numbers', () => {
- return expectDisplayResult('display(5 < 10); display(10 < 5);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "true",
- "false",
- ]
- `)
- })
-
- test('LTG works for strings', () => {
- return expectDisplayResult('display("abc" < "bcd"); display("bcd" < "abc");', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "true",
- "false",
- ]
- `)
- })
-
- test('LTG fails for ill-typed operands', () => {
- return expectParsedError('1<undefined;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected string and string or number and number, got number and undefined for <."`
- )
- })
-
- test('GTG works for numbers', () => {
- return expectDisplayResult('display(5 > 10); display(10 > 5);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "false",
- "true",
- ]
- `)
- })
-
- test('GTG works for strings', () => {
- return expectDisplayResult('display("abc" > "bcd"); display("bcd" > "abc");', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "false",
- "true",
- ]
- `)
- })
-
- test('GTG fails for ill-typed operands', () => {
- return expectParsedError('1>undefined;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected string and string or number and number, got number and undefined for >."`
- )
- })
-
- test('LEG works for numbers', () => {
- return expectDisplayResult(
- stripIndent`
- display(5 <= 10);
- display(5 <= 5);
- display(10 <= 5);
- `,
- {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- "true",
- "false",
- ]
- `)
- })
-
- test('LEG works for strings', () => {
- return expectDisplayResult(
- stripIndent`
- display('abc' <= 'bcd');
- display('abc' <= 'abc');
- display('bcd' <= 'abc');
- `,
- {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- "true",
- "false",
- ]
- `)
- })
-
- test('LEG fails for ill-typed operands', () => {
- return expectParsedError('1<=undefined;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected string and string or number and number, got number and undefined for <=."`
- )
- })
-
- test('GEG works for numbers', () => {
- return expectDisplayResult(
- stripIndent`
- display(5 >= 10);
- display(5 >= 5);
- display(10 >= 5);
- `,
- {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }
- ).toMatchInlineSnapshot(`
- Array [
- "false",
- "true",
- "true",
- ]
- `)
- })
-
- test('GEG works for numbers', () => {
- return expectDisplayResult(
- stripIndent`
- display('abc' >= 'bcd');
- display('abc' >= 'abc');
- display('bcd' >= 'abc');
- `,
- {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }
- ).toMatchInlineSnapshot(`
- Array [
- "false",
- "true",
- "true",
- ]
- `)
- })
-
- test('GEG fails for ill-typed operands', () => {
- return expectParsedError('1>=undefined;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected string and string or number and number, got number and undefined for >=."`
- )
- })
-
- // NEWC, CALL, RETG
- test('function and function calls work', () => {
- return expectDisplayResult(
- stripIndent`
- function f(x) {
- display(x);
- return 1;
- }
- display(f(3));
- display(f);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "3",
- "1",
- "\\"<Function>\\"",
- ]
- `)
- })
-
- test('STLG and LDLG works', () => {
- return expectDisplayResult(`const x = 1; display(x);`, {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "1",
- ]
- `)
- })
-
- // NEWA, LDAG, STAG, DUP
- test('array opcodes work', () => {
- return expectDisplayResult(`const x = [1,2,3,1]; display(x[1]); display(x[8]);`, {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "2",
- "undefined",
- ]
- `)
- })
-
- test('LDAG fails for non-array', () => {
- return expectParsedError('1[0];', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected array, got number for array access."`
- )
- })
-
- test('LDAG fails for ill-typed argument', () => {
- return expectParsedError('const arr = []; arr["hi"];', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected number, got string for array index."`
- )
- })
-
- test('STAG fails for non-array', () => {
- return expectParsedError('0[1] = 1;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected array, got number for array access."`
- )
- })
-
- test('STAG fails for ill-typed argument', () => {
- return expectParsedError('const arr = []; arr["hi"] = 1;', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected number, got string for array index."`
- )
- })
-
- test('EQG works', () => {
- return expectDisplayResult(
- stripIndent`
- const x = [1,2];
- const f = () => {};
- const y = test_and_set;
- const z = list;
- display(undefined === undefined &&
- null === null &&
- null !== undefined &&
- true === true &&
- false === false &&
- false !== true &&
- 1 === 1 &&
- -1 === -1 &&
- x !== [1,2] &&
- x === x &&
- f === f &&
- f !== (() => {}) &&
- 'stringa' === 'stringa' &&
- 'stringa' !== 'stringb' &&
- true !== null &&
- y !== z &&
- z === list &&
- y === test_and_set &&
- 0 !== "0");
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- ]
- `)
- })
-
- test('LDPG and STPG work', () => {
- return expectDisplayResult(
- stripIndent`
- let x = 1;
- display(x);
- function f() {
- x = 3;
- }
- f();
- display(x);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "1",
- "3",
- ]
- `)
- })
-
- test('BRF works', () => {
- return expectDisplayResult(
- stripIndent`
- if (true) {
- display('did not BRF');
- } else {}
- if (false) {} else {
- display('BRF');
- }
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "\\"did not BRF\\"",
- "\\"BRF\\"",
- ]
- `)
- })
-
- test('BRF works, no else', () => {
- return expectDisplayResult(
- stripIndent`
- if (true) {
- display('did not BRF');
- }
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "\\"did not BRF\\"",
- ]
- `)
- })
-
- test('BRF works, no else 2', () => {
- return expectDisplayResult(
- stripIndent`
- if (false) {
- display("should not show");
- }
- display("should show");
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "\\"should show\\"",
- ]
- `)
- })
-
- // BR, NEWENV, POPENV
- test('while loops works', () => {
- return expectDisplayResult(
- stripIndent`
- let x = 0;
- const y = 'before NEWENV';
- display(y);
- while (x < 1) {
- const y = 'after NEWENV';
- display(y);
- x = x + 1;
- display('before BR');
- }
- display('after POPENV');
- display('after BR');
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "\\"before NEWENV\\"",
- "\\"after NEWENV\\"",
- "\\"before BR\\"",
- "\\"after POPENV\\"",
- "\\"after BR\\"",
- ]
- `)
- })
-})
-
-describe('primitive opcodes', () => {
- describe('self-implemented', () => {
- test('DISPLAY works for circular references', () => {
- return expectDisplayResult(
- stripIndent`
- const p = pair(1,2);
- const q = pair(3,4);
- set_head(q,p);
- set_tail(p,q);
- display(p);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "[1, [...<circular>, 4]]",
- ]
- `)
- })
-
- test('DISPLAY throws error if no arguments', () => {
- return expectParsedError(
- stripIndent`
- display();
- `,
- {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }
- ).toMatchInlineSnapshot(`"Error: \\"Expected 1 or more arguments, but got 0.\\""`)
- })
-
- test('ARRAY_LEN works', () => {
- return expectDisplayResult(
- stripIndent`
- const arr = [];
- const arr1 = [1,2,3];
- const p = pair(1,2);
- display(array_length(arr));
- display(array_length(arr1));
- arr[100] = 100;
- display(array_length(arr));
- display(array_length(p));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "0",
- "3",
- "101",
- "2",
- ]
- `)
- })
-
- test('ARRAY_LEN fails for ill-typed argument', () => {
- return expectParsedError('array_length(1);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected array, got number for array_length."`
- )
- })
-
- test('DRAW_DATA works', () => {
- return expectVisualiseListResult(
- stripIndent`
- draw_data(pair(true, [1]));
- draw_data(null, list(undefined, 2), "3");
- `,
- {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }
- ).toMatchInlineSnapshot(`
- Array [
- Array [
- Array [
- true,
- Array [
- 1,
- ],
- ],
- ],
- Array [
- null,
- Array [
- undefined,
- Array [
- 2,
- null,
- ],
- ],
- "3",
- ],
- ]
- `)
- })
-
- test('DRAW_DATA returns correct values', () => {
- return expectDisplayResult(
- stripIndent`
- display(draw_data(pair(true, [1])));
- display(draw_data(null, list(undefined, 2), "3"));
- `,
- {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }
- ).toMatchInlineSnapshot(`
- Array [
- "[true, [1]]",
- "null",
- ]
- `)
- })
-
- test('DRAW_DATA throws error if no arguments', () => {
- return expectParsedError(
- stripIndent`
- draw_data();
- `,
- {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }
- ).toMatchInlineSnapshot(`"Error: \\"Expected 1 or more arguments, but got 0.\\""`)
- })
-
- test('ERROR works', () => {
- return expectParsedError('error(123);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`"Error: 123"`)
- })
-
- test('IS_ARRAY works', () => {
- return expectDisplayResult(
- stripIndent`
- display(is_array([1,2]));
- display(is_array(1));
- `,
- {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- "false",
- ]
- `)
- })
-
- test('IS_BOOL works', () => {
- return expectDisplayResult(
- stripIndent`
- display(is_boolean(true));
- display(is_boolean(1));
- `,
- {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- "false",
- ]
- `)
- })
-
- test('IS_FUNC works', () => {
- return expectDisplayResult(
- stripIndent`
- display(is_function(() => {}));
- display(is_function(1));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- "false",
- ]
- `)
- })
-
- test('IS_NULL works', () => {
- return expectDisplayResult(
- stripIndent`
- display(is_null(null));
- display(is_null(1));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- "false",
- ]
- `)
- })
-
- test('IS_NUMBER works', () => {
- return expectDisplayResult(
- stripIndent`
- display(is_number(1));
- display(is_number(false));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- "false",
- ]
- `)
- })
-
- test('IS_STRING works', () => {
- return expectDisplayResult(
- stripIndent`
- display(is_string("string"));
- display(is_string(1));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- "false",
- ]
- `)
- })
-
- test('IS_UNDEFINED works', () => {
- return expectDisplayResult(
- stripIndent`
- display(is_undefined(undefined));
- display(is_undefined(1));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- "false",
- ]
- `)
- })
-
- // variadic test as well
- test('MATH_HYPOT works', () => {
- return expectDisplayResult(
- stripIndent`
- display(math_hypot(3,4));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "5",
- ]
- `)
- })
-
- test('DISPLAY_LIST works', () => {
- return expectDisplayResult(
- stripIndent`
- display_list(pair(1, null));
- display_list(pair(1, pair(2, null)), "test");
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "list(1)",
- "test list(1, 2)",
- ]
- `)
- })
-
- test('CHAR_AT works', () => {
- return expectDisplayResult(
- stripIndent`
- display(char_at("test", 1));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "\\"e\\"",
- ]
- `)
- })
-
- test('ARITY works', () => {
- return expectDisplayResult(
- stripIndent`
- display(arity(math_random));
- display(arity(accumulate));
- display(arity(display));
- display(arity((x, y) => x));
- function f() {}
- display(arity(f));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "0",
- "3",
- "0",
- "2",
- "0",
- ]
- `)
- })
-
- test('ARITY fails for ill-typed argument', () => {
- return expectParsedError('arity(1);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected closure, got number for arity."`
- )
- })
-
- // variadic test
- test('list works', () => {
- return expectDisplayResult(
- stripIndent`
- display(list(1,2,3,4));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "[1, [2, [3, [4, null]]]]",
- ]
- `)
- })
-
- test('stream_tail fails for ill-typed arguments', () => {
- return expectParsedError(
- stripIndent`
- stream_tail(1);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(
- `"Error: \\"stream_tail(xs) expects a pair as argument xs, but encountered 1\\""`
- )
- })
- })
-
- test('nullary handler', () => {
- return snapshotSuccess('get_time();', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- })
- })
-
- test('unary handler', () => {
- return expectDisplayResult(
- stripIndent`
- display(math_abs(-1));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "1",
- ]
- `)
- })
-
- test('binary handler', () => {
- return expectDisplayResult(
- stripIndent`
- display(math_pow(2,3));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "8",
- ]
- `)
- })
-
- test('math constants', () => {
- return expectDisplayResult(
- stripIndent`
- display(Infinity);
- display(NaN);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "Infinity",
- "NaN",
- ]
- `)
- })
-
- describe(Variant.CONCURRENT, () => {
- test('TEST_AND_SET works', () => {
- return expectDisplayResult(
- stripIndent`
- const x = list(false);
- display(head(x));
- test_and_set(x);
- display(head(x));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "false",
- "true",
- ]
- `)
- })
-
- test('TEST_AND_SET fails for ill-typed arguments', () => {
- return expectParsedError(
- stripIndent`
- test_and_set(1);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(
- `"Error: execution aborted: Expected array, got number for test_and_set."`
- )
- })
-
- test('CLEAR works', () => {
- return expectDisplayResult(
- stripIndent`
- const x = list(true);
- display(head(x));
- clear(x);
- display(head(x));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- "false",
- ]
- `)
- })
-
- test('CLEAR fails for ill-typed arguments', () => {
- return expectParsedError(
- stripIndent`
- clear(1);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`"Error: execution aborted: Expected array, got number for clear."`)
- })
- })
-})
-
-describe('standard program execution', () => {
- test('program always returns all threads terminated', () => {
- return expectResult('1 + 1;', { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }).toBe(
- 'all threads terminated'
- )
- })
-
- test('arrow function definitions work', () => {
- return expectDisplayResult(
- stripIndent`
- const f = x => {
- display(x);
- return 1;
- };
- const g = x => display(x);
- f(3);
- g(true);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "3",
- "true",
- ]
- `)
- })
-
- test('logical operators work', () => {
- return expectDisplayResult('display(!(true && (false || (true && !false))));', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- Array [
- "false",
- ]
- `)
- })
-
- test('&& operator shortcircuit works', () => {
- return snapshotSuccess(
- stripIndent`
- function f() {
- f();
- }
- false && f();
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- )
- })
-
- test('|| operator shortcircuit works', () => {
- return snapshotSuccess(
- stripIndent`
- function f() {
- f();
- }
- true || f();
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- )
- })
-
- test('list functions work', () => {
- return expectDisplayResult(
- stripIndent`
- function permutations(xs) {
- return is_null(xs)
- ? list(null)
- : accumulate(append,
- null,
- map(x => map(p => pair(x, p),
- permutations(remove(x,xs))),
- xs));
- }
-
- display(permutations(list(1,2,3)));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "[ [1, [2, [3, null]]],
- [ [1, [3, [2, null]]],
- [ [2, [1, [3, null]]],
- [[2, [3, [1, null]]], [[3, [1, [2, null]]], [[3, [2, [1, null]]], null]]]]]]",
- ]
- `)
- })
-
- // taken from Studio 11
- test('stream functions work', () => {
- return expectDisplayResult(
- stripIndent`
- function interleave_stream_append(s1,s2) {
- return is_null(s1)
- ? s2
- : pair(head(s1), () => interleave_stream_append(s2,
- stream_tail(s1)));
- }
-
- function stream_pairs(s) {
- return (is_null(s) || is_null(stream_tail(s)))
- ? null
- : pair(pair(head(s), head(stream_tail(s))),
- () => interleave_stream_append(
- stream_map(x => pair(head(s), x),
- stream_tail(stream_tail(s))),
- stream_pairs(stream_tail(s))));
- }
-
- const ints = integers_from(1);
- const s = stream_pairs(ints);
- display(eval_stream(s, 10));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "[ [1, 2],
- [ [1, 3],
- [ [2, 3],
- [[1, 4], [[2, 4], [[1, 5], [[3, 4], [[1, 6], [[2, 5], [[1, 7], null]]]]]]]]]]",
- ]
- `)
- })
-
- test('program times out', () => {
- return expectParsedError('while(true) {}', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`
- "Potential infinite loop detected.
- If you are certain your program is correct, press run again without editing your program.
- The time limit will be increased from 1 to 10 seconds.
- This page may be unresponsive for up to 10 seconds if you do so."
- `)
- })
-
- test('block scoping works', () => {
- return expectDisplayResult(
- stripIndent`
- const x = 1;
- function f(y) {
- display(-x);
- }
- {
- const x = 2;
- function f(y) {
- display(-x);
- }
- {
- const x = 3;
- if (true) {
- display(x);
- } else {
- error('should not reach here');
- }
- display(x);
- f(1);
- }
- display(x);
- }
- display(x);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "3",
- "3",
- "-2",
- "2",
- "1",
- ]
- `)
- })
-
- test('block scoping works, part 2', () => {
- return expectParsedError(
- stripIndent`
- {
- let i = 5;
- }
- display(i);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`"Line 4: Name i not declared."`)
- })
-
- test('return in loop throws error', () => {
- return expectParsedError(
- stripIndent`
- function f() {
- while(true) {
- return 1;
- }
- }
- f();
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`"Error: return not allowed in loops"`)
- })
-
- test('continue and break works', () => {
- return expectDisplayResult(
- stripIndent`
- while(true) {
- break;
- display(1);
- }
- let i = 0;
- for (i; i < 2; i = i + 1) {
- if (i === 1) {
- continue;
- } else {
- display(i);
- }
- }
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "0",
- ]
- `)
- })
-
- test('const assignment throws error', () => {
- return expectParsedError(
- stripIndent`
- const x = 1;
- x = 2;
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`"Line 2: Cannot assign new value to constant x."`)
- })
-
- test('treat primitive functions as first-class', () => {
- return expectDisplayResult(
- stripIndent`
- const x = list;
- display(x(1,2));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "[1, [2, null]]",
- ]
- `)
- })
-
- test('treat internal functions as first-class', () => {
- return expectDisplayResult(
- stripIndent`
- const x = test_and_set;
- const xs = list(false);
- display(x(xs));
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "false",
- ]
- `)
- })
-
- test('wrong number of arguments for internal functions throws error', () => {
- return expectParsedError(
- stripIndent`
- const x = list(false);
- test_and_set(x, 1);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`"Error: execution aborted: Expected 1 arguments, but got 2."`)
- })
-
- test('wrong number of arguments for normal functions throws error', () => {
- return expectParsedError('((x, y) => 1)(1);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`"Error: execution aborted: Expected 2 arguments, but got 1."`)
- })
-
- test('wrong number of arguments for primitive functions throws error', () => {
- return expectParsedError('math_sin(1,2);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`"Error: execution aborted: Expected 1 arguments, but got 2."`)
- })
-
- test('call non function value throws error', () => {
- return expectParsedError('let x = 0; x(1,2);', {
- chapter: Chapter.SOURCE_3,
- variant: Variant.CONCURRENT
- }).toMatchInlineSnapshot(`"Error: execution aborted: calling non-function value 0."`)
- })
-
- test('tail call for internal functions work', () => {
- return expectDisplayResult(
- stripIndent`
- function f() {
- return test_and_set(list(true));
- }
- display(f());
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "true",
- ]
- `)
- })
-
- test('closures declared in for loops work', () => {
- return expectDisplayResult(
- stripIndent`
- let f = null;
- f = () => { display(-1); };
- for(let i = 0; i < 5; i = i + 1) {
- if (i === 3) {
- f = () => { display(i); };
- } else {}
- }
- f();
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "3",
- ]
- `)
- })
-
- test('nested for loops work', () => {
- return expectDisplayResult(
- stripIndent`
- for (let i = 0; i < 10; i = i + 1) {
- for (let j = 0; j < 10; j = j + 1) {}
- display(i);
- }
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "0",
- "1",
- "2",
- "3",
- "4",
- "5",
- "6",
- "7",
- "8",
- "9",
- ]
- `)
- })
-
- test('nested for loops with same identifier work', () => {
- return expectDisplayResult(
- stripIndent`
- for (let i = 0; i < 3; i = i + 1) {
- for (let i = 0; i < 3; i = i + 1) {
- display(i, "inner");
- }
- display(i, "outer");
- }
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "inner 0",
- "inner 1",
- "inner 2",
- "outer 0",
- "inner 0",
- "inner 1",
- "inner 2",
- "outer 1",
- "inner 0",
- "inner 1",
- "inner 2",
- "outer 2",
- ]
- `)
- })
-
- test('continue in while loops works', () => {
- return expectDisplayResult(
- stripIndent`
- let x = false;
- while (true) {
- if (x) {
- break;
- } else {
- x = true;
- }
- continue;
- }
- display(0);
- `,
- { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }
- ).toMatchInlineSnapshot(`
- Array [
- "0",
- ]
- `)
- })
-})
-
-// fails with a large enough TO
-test('concurrent program execution interleaves', () => {
- const code = stripIndent`
- const t1 = () => {
- for(let i = 0; i < 50; i = i + 1) {
- display('t1');
- }
- };
- const t2 = () => {
- for(let i = 0; i < 50; i = i + 1) {
- display('t2');
- }
- };
- concurrent_execute(t1, t2);
- for(let i = 0; i < 50; i = i + 1) {
- display('main');
- }
- `
- return getDisplayResult(code, { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT }).then(
- displayResult => {
- // check for interleaving displays of main, t1 and t2
- // done by looking for 't1' and 't2' somewhere between two 'main' displays
- let firstMain = -1
- let foundT1 = false
- let foundT2 = false
- for (let i = 0; i < displayResult.length; i++) {
- const currentResult = displayResult[i]
- switch (currentResult) {
- case '"main"': {
- if (firstMain === -1) {
- firstMain = i
- continue
- }
- if (foundT1 && foundT2) {
- return
- }
- continue
- }
- case '"t1"': {
- if (firstMain === -1) {
- continue
- }
- foundT1 = true
- continue
- }
- case '"t2"': {
- if (firstMain === -1) {
- continue
- }
- foundT2 = true
- continue
- }
- default: {
- fail('Did not expect "' + currentResult + '" in output')
- }
- }
- }
- fail('Did not interleave')
- }
- )
-})
-
-// Still fails when TO is so large that this program takes more than a second to run
-test('concurrent program execution interleaves (busy wait)', () => {
- const code = stripIndent`
- let state = 0;
- const t1 = () => {
- while (state < 10) {
- if (state % 3 === 0) {
- state = state + 1;
- } else {}
- display('t1');
- }
- };
- const t2 = () => {
- while (state < 10) {
- if (state % 3 === 1) {
- state = state + 1;
- } else {}
- display('t2');
- }
- };
- concurrent_execute(t1, t2);
- while (state < 10) {
- if (state % 3 === 2) {
- state = state + 1;
- } else {}
- display('main');
- }
- `
- return getDisplayResult(code, { chapter: Chapter.SOURCE_3, variant: Variant.CONCURRENT })
-})
diff --git a/src/vm/svmc.ts b/src/vm/svmc.ts
deleted file mode 100644
index 0fe160ce1..000000000
--- a/src/vm/svmc.ts
+++ /dev/null
@@ -1,231 +0,0 @@
-import * as fs from 'fs'
-import * as util from 'util'
-
-import { createEmptyContext } from '../createContext'
-import { parse } from '../parser/parser'
-import { INTERNAL_FUNCTIONS as concurrentInternalFunctions } from '../stdlib/vm.prelude'
-import { Chapter, Variant } from '../types'
-import { assemble } from './svml-assembler'
-import { compileToIns } from './svml-compiler'
-import { stringifyProgram } from './util'
-
-interface CliOptions {
- compileTo: 'debug' | 'json' | 'binary' | 'ast'
- sourceChapter: Chapter.SOURCE_1 | Chapter.SOURCE_2 | Chapter.SOURCE_3
- sourceVariant: Variant.DEFAULT | Variant.CONCURRENT // does not support other variants
- inputFilename: string
- outputFilename: string | null
- vmInternalFunctions: string[] | null
-}
-
-const readFileAsync = util.promisify(fs.readFile)
-const writeFileAsync = util.promisify(fs.writeFile)
-
-// This is a console program. We're going to print.
-/* tslint:disable:no-console */
-
-function parseOptions(): CliOptions | null {
- const ret: CliOptions = {
- compileTo: 'binary',
- sourceChapter: Chapter.SOURCE_3,
- sourceVariant: Variant.DEFAULT,
- inputFilename: '',
- outputFilename: null,
- vmInternalFunctions: null
- }
-
- let endOfOptions = false
- let error = false
- const args = process.argv.slice(2)
- while (args.length > 0) {
- let option = args[0]
- let argument = args[1]
- let argShiftNumber = 2
- if (!endOfOptions && option.startsWith('--') && option.includes('=')) {
- ;[option, argument] = option.split('=')
- argShiftNumber = 1
- }
- if (!endOfOptions && option.startsWith('-')) {
- switch (option) {
- case '--compile-to':
- case '-t':
- switch (argument) {
- case 'debug':
- case 'json':
- case 'binary':
- case 'ast':
- ret.compileTo = argument
- break
- default:
- console.error('Invalid argument to --compile-to: %s', argument)
- error = true
- break
- }
- args.splice(0, argShiftNumber)
- break
- case '--chapter':
- case '-c':
- const argInt = parseInt(argument, 10)
- if (argInt === 1 || argInt === 2 || argInt === 3) {
- ret.sourceChapter = argInt
- } else {
- console.error('Invalid Source chapter: %d', argInt)
- error = true
- }
- args.splice(0, argShiftNumber)
- break
- case '--variant':
- case '-v':
- switch (argument) {
- case Variant.DEFAULT:
- case Variant.CONCURRENT:
- ret.sourceVariant = argument
- break
- default:
- console.error('Invalid/Unsupported Source Variant: %s', argument)
- error = true
- break
- }
- args.splice(0, argShiftNumber)
- break
- case '--out':
- case '-o':
- ret.outputFilename = argument
- args.splice(0, argShiftNumber)
- break
- case '--internals':
- case '-i':
- ret.vmInternalFunctions = JSON.parse(argument)
- args.splice(0, argShiftNumber)
- break
- case '--':
- endOfOptions = true
- args.shift()
- break
- default:
- console.error('Unknown option %s', option)
- args.shift()
- error = true
- break
- }
- } else {
- if (ret.inputFilename === '') {
- ret.inputFilename = args[0]
- } else {
- console.error('Excess non-option argument: %s', args[0])
- error = true
- }
- args.shift()
- }
- }
-
- if (ret.inputFilename === '') {
- console.error('No input file specified')
- error = true
- }
-
- return error ? null : ret
-}
-
-async function main() {
- const options = parseOptions()
- if (options == null) {
- console.error(`Usage: svmc [options...] <input file>
-
-Options:
--t, --compile-to <option>: [binary]
- json: Compile only, but don't assemble.
- binary: Compile and assemble.
- debug: Compile and pretty-print the compiler output. For debugging the compiler.
- ast: Parse and pretty-print the AST. For debugging the parser.
--c, --chapter <chapter>: [3]
- 1, 2, 3. Sets the Source chapter.
--v, --variant <variant>: [default]
- default: Normal Source
- concurrent: Concurrent Source (Assumes and overwrites chosen chapter with 3)
--o, --out <filename>: [see below]
- Sets the output filename.
- Defaults to the input filename, minus any '.js' extension, plus '.svm'.
--i, --internals <JSON array of internal names>: ["[]"]
- Sets the list of VM-internal functions. The argument should be a JSON array of
- strings containing the names of the VM-internal functions.
---:
- Signifies the end of arguments, in case your input filename starts with -.`)
- process.exitCode = 1
- return
- }
-
- const source = await readFileAsync(options.inputFilename, 'utf8')
- const context = createEmptyContext(options.sourceChapter, options.sourceVariant, [], null)
- const program = parse(source, context)
-
- let numWarnings = 0
- let numErrors = 0
- for (const error of context.errors) {
- console.error(
- '[%s] (%d:%d) %s',
- error.severity,
- error.location.start.line,
- error.location.start.column,
- error.explain()
- )
- switch (error.severity) {
- case 'Warning':
- ++numWarnings
- break
- case 'Error':
- ++numErrors
- break
- }
- }
-
- if (numWarnings > 0 || numErrors > 0) {
- console.error('%d warning(s) and %d error(s) produced.', numWarnings, numErrors)
- }
-
- if (program === null) {
- process.exitCode = 1
- return
- }
-
- if (options.compileTo === 'ast') {
- console.log(JSON.stringify(program, undefined, 2))
- return
- }
-
- if (options.sourceVariant === Variant.CONCURRENT && options.vmInternalFunctions) {
- console.warn('Warning: ignoring internal functions specified on command line for concurrent VM')
- }
-
- const vmInternalFunctions =
- options.sourceVariant === Variant.CONCURRENT
- ? concurrentInternalFunctions.map(([name]) => name)
- : options.vmInternalFunctions || []
-
- // the current compiler does not differentiate between chapters 1, 2 or 3
- const compiled = compileToIns(program, undefined, vmInternalFunctions)
-
- if (options.compileTo === 'debug') {
- console.log(stringifyProgram(compiled).trimRight())
- return
- } else if (options.compileTo === 'json') {
- console.log(JSON.stringify(compiled))
- return
- }
-
- const binary = assemble(compiled)
-
- switch (options.outputFilename) {
- case '-':
- process.stdout.write(binary)
- break
- case null:
- options.outputFilename = options.inputFilename.replace(/\.js$/i, '') + '.svm'
- default:
- return writeFileAsync(options.outputFilename, binary)
- }
-}
-
-main().catch(err => {
- console.error(err)
-})
diff --git a/src/vm/svml-machine.ts b/src/vm/svml-machine.ts
deleted file mode 100644
index 370f4eec1..000000000
--- a/src/vm/svml-machine.ts
+++ /dev/null
@@ -1,1872 +0,0 @@
-import { JSSLANG_PROPERTIES } from '../constants'
-import { PotentialInfiniteLoopError } from '../errors/timeoutErrors'
-import {
- BINARY_PRIMITIVES,
- EXTERNAL_PRIMITIVES,
- INTERNAL_FUNCTIONS,
- NULLARY_PRIMITIVES,
- UNARY_PRIMITIVES,
- VARARGS_NUM_ARGS
-} from '../stdlib/vm.prelude'
-import { Context } from '../types'
-import { locationDummyNode } from '../utils/ast/astCreator'
-import { stringify } from '../utils/stringify'
-import OpCodes from './opcodes'
-import { Address, Instruction, Program, SVMFunction } from './svml-compiler'
-import { RoundRobinScheduler, Scheduler, ThreadId } from './svml-scheduler'
-import { getName } from './util'
-
-const LDCI_VALUE_OFFSET = 1
-const LDCF32_VALUE_OFFSET = 1
-const LDCF64_VALUE_OFFSET = 1
-const LGCS_VALUE_OFFSET = 1
-const FUNC_MAX_STACK_SIZE_OFFSET = 0
-const FUNC_ENV_SIZE_OFFSET = 1
-const FUNC_NUM_ARGS_OFFSET = 2
-const FUNC_CODE_OFFSET = 3
-const INS_OPCODE_OFFSET = 0
-const BR_OFFSET = 1
-const LD_ST_INDEX_OFFSET = 1
-const LD_ST_ENV_OFFSET = 2
-const CALL_NUM_ARGS_OFFSET = 1
-const CALLT_NUM_ARGS_OFFSET = 1
-const CALLP_ID_OFFSET = 1
-const CALLP_NUM_ARGS_OFFSET = 2
-const CALLTP_ID_OFFSET = 1
-const CALLTP_NUM_ARGS_OFFSET = 2
-const CALLV_ID_OFFSET = 1
-const CALLV_NUM_ARGS_OFFSET = 2
-const CALLTV_ID_OFFSET = 1
-const CALLTV_NUM_ARGS_OFFSET = 2
-const NEWC_ADDR_OFFSET = 1
-const ADDR_FUNC_INDEX_OFFSET = 0
-const NEWENV_NUM_ARGS_OFFSET = 1
-const NEWCP_ID_OFFSET = 1
-const NEWCV_ID_OFFSET = 1
-
-// VIRTUAL MACHINE
-
-// "registers" are the global variables of our machine.
-// These contain primitive values (numbers or boolean
-// values) or arrays of primitive values
-
-// PROG contains the entire SVML JSON formatted program
-let PROG: Program
-// FUNC contains the function array, for easier access
-let FUNC: SVMFunction[]
-// INTERNAL is the function array for internal functions
-const INTERNAL: [string, OpCodes, number, boolean][] = INTERNAL_FUNCTIONS
-const INTERNAL_OPCODE_SLOT = 1
-const INTERNAL_NUM_ARGS_SLOT = 2
-const INTERNAL_HAS_RETURN_VAL_SLOT = 3
-
-// GLOBAL_ENV is the env that contains all the primitive functions
-let GLOBAL_ENV = -1
-// HEAP is array containing all dynamically allocated data structures
-let HEAP: any[] = []
-// next free slot in heap
-let FREE = 0
-// temporary value, used by PUSH and POP; initially a dummy value
-let RES = -Infinity
-
-// THREAD STATE
-
-// P contains the instructions to be executed in the current function call
-let P: Instruction[]
-// PC is program counter: index of the next instruction in P
-let PC = 0
-// ENV is address of current environment in HEAP; initially a dummy value
-let ENV = -1
-// OS is address of current operand stack in HEAP; initially a dummy value
-let OS = -Infinity
-// RTS contains the call stack
-let RTS: any[] = []
-// top index of RTS stack
-let TOP_RTS = -1
-
-/**
- * when executing concurrent code
- */
-// TO is timeout counter: how many instructions are left for a thread to run
-let TO = 0
-
-// some general-purpose registers
-let A: any = 0
-let B: any = 0
-let C: any = 0
-let D: any = 0
-let E: any = 0
-let F: any = 0
-let G: any = 0
-let H: any = 0
-let I: any = 0
-let J: any = 0
-let K: any = 0
-
-function show_executing(s: string) {
- let str = ''
- str += '--- RUN ---' + s + '\n'
- str += 'PC :' + PC + '\n'
- str += 'instr:' + getName(P[PC][INS_OPCODE_OFFSET])
- return str
-}
-
-// for debugging: show all registers
-export function show_registers(s: string, isShowExecuting = true) {
- let str = ''
- if (isShowExecuting) {
- str = show_executing(s) + '\n'
- }
- str += '--- REGISTERS ---' + s + '\n'
- str += 'RES:' + RES + '\n'
- str += 'A :' + A + '\n'
- str += 'B :' + B + '\n'
- str += 'C :' + C + '\n'
- str += 'D :' + D + '\n'
- str += 'E :' + E + '\n'
- str += 'F :' + F + '\n'
- str += 'G :' + G + '\n'
- str += 'H :' + H + '\n'
- str += 'I :' + I + '\n'
- str += 'OS :' + OS + '\n'
- str += 'ENV:' + ENV + '\n'
- str += 'RTS:' + RTS + '\n'
- str += 'TOP_RTS:' + TOP_RTS + '\n'
- str += 'TO:' + TO + '\n'
- str += 'scheduler_state:' + scheduler_state_string() + '\n'
- return str
-}
-
-// register that says if machine is running
-let RUNNING = true
-
-const NORMAL = 0
-const DIV_ERROR = 1
-const TYPE_ERROR = 2
-const NUM_ARGS_ERROR = 3
-const CALL_NON_FUNCTION_ERROR = 4
-
-let ERROR_MSG_ARGS: any[] = []
-
-let STATE = NORMAL
-
-// general node layout
-const TAG_SLOT = 0
-const SIZE_SLOT = 1
-const FIRST_CHILD_SLOT = 2
-const LAST_CHILD_SLOT = 3
-
-// NEW expects tag in A and size in B
-function NEW() {
- HEAP[FREE + TAG_SLOT] = A
- HEAP[FREE + SIZE_SLOT] = B
- RES = FREE
- FREE = FREE + B
-}
-
-// boxed nodes
-const BOXED_VALUE_SLOT = 4
-
-// number nodes layout
-//
-// 0: tag = -100
-// 1: size = 5
-// 2: offset of first child from the tag: 6 (no children)
-// 3: offset of last child from the tag: 5 (must be less than first)
-// 4: value
-
-const NUMBER_TAG = -100
-const NUMBER_SIZE = 5
-const NUMBER_VALUE_SLOT = 4
-
-// changes A, B, C, expects number in A
-function NEW_NUMBER() {
- C = A
- A = NUMBER_TAG
- B = NUMBER_SIZE
- NEW()
- HEAP[RES + FIRST_CHILD_SLOT] = 6
- HEAP[RES + LAST_CHILD_SLOT] = 5 // no children
- HEAP[RES + NUMBER_VALUE_SLOT] = C
-}
-
-// bool nodes layout
-//
-// 0: tag = -101
-// 1: size = 5
-// 2: offset of first child from the tag: 6 (no children)
-// 3: offset of last child from the tag: 5 (must be less than first)
-// 4: value
-
-const BOOL_TAG = -101
-const BOOL_SIZE = 5
-const BOOL_VALUE_SLOT = 4
-
-// changes A, B, C, expects boolean value in A
-function NEW_BOOL() {
- C = A
- A = BOOL_TAG
- B = BOOL_SIZE
- NEW()
- HEAP[RES + FIRST_CHILD_SLOT] = 6
- HEAP[RES + LAST_CHILD_SLOT] = 5 // no children
- HEAP[RES + BOOL_VALUE_SLOT] = C
-}
-
-// string nodes layout
-//
-// 0: tag = -107
-// 1: size = 5
-// 2: offset of first child from the tag: 6 (no children)
-// 3: offset of last child from the tag: 5 (must be less than first)
-// 4: value
-
-const STRING_TAG = -107
-const STRING_SIZE = 5
-const STRING_VALUE_SLOT = 4
-
-// changes A, B, C, expects string literal in A
-function NEW_STRING() {
- C = A
- A = STRING_TAG
- B = STRING_SIZE
- NEW()
- HEAP[RES + FIRST_CHILD_SLOT] = 6
- HEAP[RES + LAST_CHILD_SLOT] = 5 // no children
- HEAP[RES + STRING_VALUE_SLOT] = C
-}
-
-// array nodes layout
-//
-// 0: tag = -108
-// 1: size = 5
-// 2: offset of first child from the tag: 6 (no children)
-// 3: offset of last child from the tag: 5 (must be less than first)
-// 4: value (JS array, each element is the address of the element's node in the heap)
-// 5: current size of array (largest index assigned)
-
-const ARRAY_TAG = -108
-const ARRAY_SIZE = 6
-const ARRAY_VALUE_SLOT = 4
-const ARRAY_SIZE_SLOT = 5
-
-// changes A, B
-function NEW_ARRAY() {
- A = ARRAY_TAG
- B = ARRAY_SIZE
- NEW()
- HEAP[RES + FIRST_CHILD_SLOT] = 6
- HEAP[RES + LAST_CHILD_SLOT] = 5 // no children
- HEAP[RES + ARRAY_VALUE_SLOT] = []
- HEAP[RES + ARRAY_SIZE_SLOT] = 0
-}
-
-// undefined nodes layout
-//
-// 0: tag = -106
-// 1: size = 4
-// 2: offset of first child from the tag: 5 (no children)
-// 3: offset of last child from the tag: 4 (must be less than first)
-
-const UNDEFINED_TAG = -106
-const UNDEFINED_SIZE = 4
-
-function NEW_UNDEFINED() {
- A = UNDEFINED_TAG
- B = UNDEFINED_SIZE
- NEW()
- HEAP[RES + FIRST_CHILD_SLOT] = 5
- HEAP[RES + LAST_CHILD_SLOT] = 4 // no children
-}
-
-// null nodes layout
-//
-// 0: tag = -109
-// 1: size = 4
-// 2: offset of first child from the tag: 5 (no children)
-// 3: offset of last child from the tag: 4 (must be less than first)
-
-const NULL_TAG = -109
-const NULL_SIZE = 4
-
-// changes A, B.
-function NEW_NULL() {
- A = NULL_TAG
- B = NULL_SIZE
- NEW()
- HEAP[RES + FIRST_CHILD_SLOT] = 5
- HEAP[RES + LAST_CHILD_SLOT] = 4 // no children
-}
-
-// operandstack nodes layout
-//
-// 0: tag = -105
-// 1: size = maximal number of entries + 4
-// 2: first child slot = 4
-// 3: last child slot = current top of stack; initially 3 (empty stack)
-// 4: first entry
-// 5: second entry
-// ...
-
-const OS_TAG = -105
-
-// changes A, B, C, expects max size in A
-function NEW_OS() {
- C = A
- A = OS_TAG
- B = C + 4
- NEW()
- HEAP[RES + FIRST_CHILD_SLOT] = 4
- // operand stack initially empty
- HEAP[RES + LAST_CHILD_SLOT] = 3
-}
-
-// PUSH and POP are convenient subroutines that operate on
-// the operand stack OS
-// PUSH expects its argument in A
-// changes B
-function PUSH_OS() {
- B = HEAP[OS + LAST_CHILD_SLOT] // address of current top of OS
- B = B + 1
- HEAP[OS + LAST_CHILD_SLOT] = B // update address of current top of OS
- HEAP[OS + B] = A
-}
-
-// POP puts the top-most value into RES
-// changes B
-function POP_OS() {
- B = HEAP[OS + LAST_CHILD_SLOT] // address of current top of OS
- HEAP[OS + LAST_CHILD_SLOT] = B - 1 // update address of current top of OS
- RES = HEAP[OS + B]
-}
-
-// closure nodes layout
-//
-// 0: tag = -103
-// 1: size = 7
-// 2: offset of first child from the tag: 6 (only environment)
-// 3: offset of last child from the tag: 6
-// 4: type of function (normal, primitive, internal)
-// 5: index = index of function in program function array
-// 6: environment
-
-const CLOSURE_TAG = -103
-const CLOSURE_SIZE = 7
-const CLOSURE_NORMAL_TYPE = 0
-// not necessary right now due to the way primitives are handled
-// const CLOSURE_PRIMITIVE_TYPE = 1
-const CLOSURE_INTERNAL_TYPE = 2
-const CLOSURE_TYPE_SLOT = 4
-const CLOSURE_FUNC_INDEX_SLOT = 5
-const CLOSURE_ENV_SLOT = 6
-
-// changes A, B, E, F
-// expects index of function in FUNC / INTERNAL in A
-// expects type of function in B
-export function NEW_FUNCTION() {
- E = A
- F = B
- A = CLOSURE_TAG
- B = CLOSURE_SIZE
- NEW()
- HEAP[RES + FIRST_CHILD_SLOT] = CLOSURE_ENV_SLOT
- HEAP[RES + LAST_CHILD_SLOT] = CLOSURE_ENV_SLOT
- HEAP[RES + CLOSURE_TYPE_SLOT] = F
- HEAP[RES + CLOSURE_FUNC_INDEX_SLOT] = E
- HEAP[RES + CLOSURE_ENV_SLOT] = ENV
-}
-
-// stackframe nodes layout
-//
-// 0: tag = -104
-// 1: size = 7
-// 2: offset of first child from the tag: 5 (environment)
-// 3: offset of last child from the tag: 6 (operand stack)
-// 4: program counter = return address
-// 5: environment
-// 6: operand stack
-// 7: current function code array
-
-const RTS_FRAME_TAG = -104
-const RTS_FRAME_SIZE = 8
-const RTS_FRAME_PC_SLOT = 4
-const RTS_FRAME_ENV_SLOT = 5
-const RTS_FRAME_OS_SLOT = 6
-const RTS_FRAME_FUNC_INS_SLOT = 7
-
-// changes A, B, expects current PC, ENV, OS, P, TOP_RTS in their registers
-function NEW_RTS_FRAME() {
- A = RTS_FRAME_TAG
- B = RTS_FRAME_SIZE
- NEW()
- HEAP[RES + FIRST_CHILD_SLOT] = RTS_FRAME_ENV_SLOT
- HEAP[RES + LAST_CHILD_SLOT] = RTS_FRAME_OS_SLOT
- HEAP[RES + RTS_FRAME_PC_SLOT] = PC + 1 // next instruction!
- HEAP[RES + RTS_FRAME_ENV_SLOT] = ENV
- HEAP[RES + RTS_FRAME_OS_SLOT] = OS
- HEAP[RES + RTS_FRAME_FUNC_INS_SLOT] = P
-}
-
-// expects stack frame in A
-function PUSH_RTS() {
- TOP_RTS = TOP_RTS + 1
- RTS[TOP_RTS] = A
-}
-
-// places stack frame into RES
-function POP_RTS() {
- RES = RTS[TOP_RTS]
- TOP_RTS = TOP_RTS - 1
-}
-
-// environment nodes layout
-//
-// 0: tag = -102
-// 1: size = number of entries + 5
-// 2: first child = 5
-// 3: last child
-// 4: previous env
-// 5: first entry
-// 6: second entry
-// ...
-
-const ENV_TAG = -102
-// Indicates previous environment
-const PREVIOUS_ENV_SLOT = 4
-const NIL = -1
-
-// expects number of env entries in A, previous env in B
-// changes A, B, C
-function NEW_ENVIRONMENT() {
- C = A
- D = B
- A = ENV_TAG
- B = C + 5
- NEW()
- HEAP[RES + FIRST_CHILD_SLOT] = 5
- HEAP[RES + LAST_CHILD_SLOT] = 4 + C
- HEAP[RES + PREVIOUS_ENV_SLOT] = D
-}
-
-// expect operands to check equality for in C and D
-// return result as boolean literal in A
-function CHECK_EQUAL() {
- A = C === D // same reference (for arrays and normal functions)
- B = HEAP[C + TAG_SLOT] === HEAP[D + TAG_SLOT] // check same type
- E = HEAP[C + TAG_SLOT] === UNDEFINED_TAG
- A = A || (B && E) // check undefined
- E = HEAP[C + TAG_SLOT] === NULL_TAG
- A = A || (B && E) // check null
-
- E = HEAP[C + TAG_SLOT] === CLOSURE_TAG // check functions
- if (B && E) {
- // if internal, compare index
- E = HEAP[C + CLOSURE_TYPE_SLOT] === HEAP[D + CLOSURE_TYPE_SLOT]
- E = E && HEAP[C + CLOSURE_FUNC_INDEX_SLOT] === HEAP[D + CLOSURE_FUNC_INDEX_SLOT]
- A = A || E
- }
-
- E = HEAP[C + TAG_SLOT] === NUMBER_TAG
- E = E || HEAP[C + TAG_SLOT] === STRING_TAG
- E = E || HEAP[C + TAG_SLOT] === BOOL_TAG
- E = E && B // check same type and has boxed value
- C = HEAP[C + BOXED_VALUE_SLOT]
- D = HEAP[D + BOXED_VALUE_SLOT]
- E = E && C === D
- A = A || E
-}
-
-const NORMAL_CALL = 0
-const TAIL_CALL = 1
-const PRIMITIVE_CALL = 2
-const PRIMITIVE_TAIL_CALL = 3
-const INTERNAL_CALL = 4
-const INTERNAL_TAIL_CALL = 5
-
-// expect number of arguments in G, closure (index for internal) in F,
-// type of call in J
-// currently only checks number of arguments for variadic functions
-// uses A,B,C,D,E,F,G,H,I,J,K
-function FUNCTION_CALL() {
- if (
- J === INTERNAL_CALL ||
- J === INTERNAL_TAIL_CALL ||
- ((J === NORMAL_CALL || J === TAIL_CALL) &&
- HEAP[F + CLOSURE_TYPE_SLOT] === CLOSURE_INTERNAL_TYPE)
- ) {
- if (J === NORMAL_CALL || J === TAIL_CALL) {
- F = HEAP[F + CLOSURE_FUNC_INDEX_SLOT]
- }
- INTERNAL_FUNCTION_CALL()
- } else {
- // prep for new environment
- B = HEAP[F + CLOSURE_ENV_SLOT]
- // A is now env to be extended
- H = HEAP[F + CLOSURE_FUNC_INDEX_SLOT]
- H = FUNC[H]
- // H is now the function header of the function to call
- I = H[FUNC_NUM_ARGS_OFFSET]
- A = H[FUNC_ENV_SIZE_OFFSET]
- // A is now the environment extension count
- NEW_ENVIRONMENT() // after this, RES is new env
- E = RES
-
- // for varargs (-1), put all elements into an array. hacky implementation
- if (I === VARARGS_NUM_ARGS) {
- NEW_ARRAY()
- I = RES
- for (C = G - 1; C >= 0; C = C - 1) {
- POP_OS()
- HEAP[I + ARRAY_VALUE_SLOT][C] = RES
- }
- HEAP[I + ARRAY_SIZE_SLOT] = G // manually update array length
- D = E + HEAP[E + FIRST_CHILD_SLOT]
- HEAP[D] = I
- } else if (I === G) {
- D = E + HEAP[E + FIRST_CHILD_SLOT] + G - 1
- // D is now address where last argument goes in new env
- for (C = D; C > D - G; C = C - 1) {
- POP_OS() // now RES has the address of the next arg
- HEAP[C] = RES // copy argument into new env
- }
- } else {
- STATE = NUM_ARGS_ERROR
- ERROR_MSG_ARGS[0] = I
- ERROR_MSG_ARGS[1] = G
- RUNNING = false
- }
-
- if (J === NORMAL_CALL || J === TAIL_CALL) {
- POP_OS() // closure is on top of OS; pop it as not needed
- }
- if (J === NORMAL_CALL || J === PRIMITIVE_CALL) {
- // normal calls need to push to RTS
- NEW_RTS_FRAME() // saves PC+1, ENV, OS, P
- A = RES
- PUSH_RTS()
- }
- PC = 0
- P = H[FUNC_CODE_OFFSET]
- A = H[FUNC_MAX_STACK_SIZE_OFFSET]
- NEW_OS()
- OS = RES
- ENV = E
- }
-}
-
-// expects type of call in J, internal function id in F
-// number of arguments in G
-// actually no difference between tail and normal
-function INTERNAL_FUNCTION_CALL() {
- F = INTERNAL[F]
- K = F // save the internal function
- if (K[INTERNAL_NUM_ARGS_SLOT] !== VARARGS_NUM_ARGS && K[INTERNAL_NUM_ARGS_SLOT] !== G) {
- STATE = NUM_ARGS_ERROR
- ERROR_MSG_ARGS[0] = K[INTERNAL_NUM_ARGS_SLOT]
- ERROR_MSG_ARGS[1] = G
- RUNNING = false
- } else {
- M[K[INTERNAL_OPCODE_SLOT]]() // call subroutine directly
-
- if (K[INTERNAL_HAS_RETURN_VAL_SLOT]) {
- // pop return value if present
- POP_OS()
- D = RES
- } else {
- NEW_UNDEFINED()
- D = RES
- }
- if (J === NORMAL_CALL || J === TAIL_CALL) {
- POP_OS() // pop closure
- }
- A = D
- PUSH_OS() // push return value back
- PC = PC + 1
- }
-}
-
-type Thread = [
- number, // OS
- number, // ENV
- number, // PC
- Instruction[], // P
- any[], // RTS
- number // TOP_RTS
-]
-
-let scheduler: Scheduler = new RoundRobinScheduler()
-const threads: Map<ThreadId, Thread> = new Map()
-let currentThreadId: ThreadId = -1
-
-// Initialize the scheduler (do this before running code)
-function INIT_SCHEDULER() {
- scheduler = new RoundRobinScheduler()
- threads.clear()
-}
-
-// Schedule new thread for later execution using the thread state currently in VM
-// You will want to pop another thread, restore thread state, etc.
-// after calling this, as the current thread state should not be running
-function NEW_THREAD() {
- const newId = scheduler.newThread()
- threads.set(newId, [OS, ENV, PC, P, RTS, TOP_RTS])
-}
-
-// Schedule current thread for later execution
-// You will want to pop another thread, restore thread state, etc.
-// after calling this, as the current thread state should not be running
-function PAUSE_THREAD() {
- // Save state to threads map
- threads.set(currentThreadId, [OS, ENV, PC, P, RTS, TOP_RTS])
-
- // Pause thread in scheduler
- scheduler.pauseThread(currentThreadId)
-}
-
-function DELETE_CURRENT_THREAD() {
- // Clear state from threads map
- threads.delete(currentThreadId)
-
- // Delete thread from scheduler
- scheduler.deleteCurrentThread(currentThreadId)
- currentThreadId = -1
-}
-
-// Get thread from scheduler and run it
-function RUN_THREAD() {
- ;[currentThreadId, TO] = scheduler.runThread()!
-
- // Load thread state
- ;[OS, ENV, PC, P, RTS, TOP_RTS] = threads.get(currentThreadId)!
-}
-
-// Returns the number of threads in the scheduler
-function GET_NUM_IDLE_THREADS() {
- RES = scheduler.numIdle()
-}
-
-function scheduler_state_string() {
- return new Array(scheduler.idleThreads).toString()
-}
-
-// debugging: show current heap
-function is_node_tag(x: number) {
- return x !== undefined && x <= -100 && x >= -110
-}
-function node_kind(x: number) {
- return x === NUMBER_TAG
- ? 'number'
- : x === BOOL_TAG
- ? 'boolean'
- : x === CLOSURE_TAG
- ? 'closure'
- : x === RTS_FRAME_TAG
- ? 'RTS frame'
- : x === OS_TAG
- ? 'OS'
- : x === ENV_TAG
- ? 'environment'
- : x === UNDEFINED_TAG
- ? 'undefined'
- : x === NULL_TAG
- ? 'null'
- : x === STRING_TAG
- ? 'string'
- : x === ARRAY_TAG
- ? 'array'
- : ' (unknown node kind)'
-}
-export function show_heap(s: string) {
- const len = HEAP.length
- let i = 0
- let str = ''
- str += '--- HEAP --- ' + s + '\n'
- while (i < len) {
- str +=
- i +
- ': ' +
- HEAP[i] + // TODO is_number(HEAP[i]) &&
- (is_node_tag(HEAP[i]) ? ' (' + node_kind(HEAP[i]) + ')' : '') +
- '\n'
- i = i + 1
- }
- return str
-}
-
-export function show_heap_value(address: number) {
- return (
- 'result: heap node of type = ' +
- node_kind(HEAP[address]) +
- ', value = ' +
- HEAP[address + NUMBER_VALUE_SLOT]
- )
-}
-
-// SVML implementation
-
-// We implement our machine with an array M that
-// contains subroutines. Each subroutine implements
-// a machine instruction, using a nullary function.
-// The machine can then index into M using the op-codes
-// of the machine instructions. To be implementable on
-// common hardware, the subroutines have the
-// following structure:
-// * they have no parameters
-// * they do not return any results
-// * they do not have local variables
-// * they do not call other functions except the
-// subroutines PUSH and POP
-// * each line is very simple, for example an array access
-// Ideally, each line can be implemented directly with a
-// machine instruction of a real computer. In that case,
-// the subroutines could become machine language macros,
-// and the compiler could generate real machine code.
-// There are some exceptions due to the need to support
-// primitive functions or certain behavior
-
-const M: (() => void)[] = []
-
-M[OpCodes.NOP] = () => {
- PC = PC + 1
-}
-
-M[OpCodes.LGCI] = () => {
- A = P[PC][LDCI_VALUE_OFFSET]
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.LGCF32] = () => {
- A = P[PC][LDCF32_VALUE_OFFSET]
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.LGCF64] = () => {
- A = P[PC][LDCF64_VALUE_OFFSET]
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.LGCB0] = () => {
- A = false
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.LGCB1] = () => {
- A = true
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.LGCU] = () => {
- NEW_UNDEFINED()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.LGCN] = () => {
- NEW_NULL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.LGCS] = () => {
- A = P[PC][LGCS_VALUE_OFFSET]
- NEW_STRING()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.POPG] = () => {
- POP_OS()
- PC = PC + 1
-}
-
-// type check here as we need to know whether number or string
-M[OpCodes.ADDG] = () => {
- POP_OS()
- I = RES
- POP_OS()
- G = RES
- H = HEAP[I + TAG_SLOT] === HEAP[G + TAG_SLOT]
- D = HEAP[I + TAG_SLOT] === NUMBER_TAG
- F = H && D
- if (F) {
- A = HEAP[I + NUMBER_VALUE_SLOT]
- A = HEAP[G + NUMBER_VALUE_SLOT] + A
- NEW_NUMBER()
- }
- E = HEAP[I + TAG_SLOT] === STRING_TAG
- F = H && E
- if (F) {
- A = HEAP[I + STRING_VALUE_SLOT]
- A = HEAP[G + STRING_VALUE_SLOT] + A
- NEW_STRING()
- }
- A = RES
- PUSH_OS()
- PC = PC + 1
- J = D || E
- J = !(J && H)
- if (J) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'string and string or number and number'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[G + TAG_SLOT])} and ${node_kind(HEAP[I + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = '+'
- RUNNING = false
- }
-}
-
-M[OpCodes.SUBG] = () => {
- POP_OS()
- D = RES
- POP_OS()
- E = RES
- A = HEAP[D + NUMBER_VALUE_SLOT]
- A = HEAP[E + NUMBER_VALUE_SLOT] - A
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === HEAP[E + TAG_SLOT]
- G = G && HEAP[D + TAG_SLOT] === NUMBER_TAG
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'number and number'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[E + TAG_SLOT])} and ${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = '-'
- RUNNING = false
- }
-}
-
-M[OpCodes.MULG] = () => {
- POP_OS()
- D = RES
- POP_OS()
- E = RES
- A = HEAP[D + NUMBER_VALUE_SLOT]
- A = HEAP[E + NUMBER_VALUE_SLOT] * A
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === HEAP[E + TAG_SLOT]
- G = G && HEAP[D + TAG_SLOT] === NUMBER_TAG
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'number and number'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[E + TAG_SLOT])} and ${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = '*'
- RUNNING = false
- }
-}
-
-M[OpCodes.DIVG] = () => {
- POP_OS()
- D = RES
- POP_OS()
- E = RES
- A = HEAP[D + NUMBER_VALUE_SLOT]
- F = A
- A = HEAP[E + NUMBER_VALUE_SLOT] / A
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === HEAP[E + TAG_SLOT]
- G = G && HEAP[D + TAG_SLOT] === NUMBER_TAG
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'number and number'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[E + TAG_SLOT])} and ${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = '/'
- RUNNING = false
- }
-
- F = G && F === 0
- if (F) {
- STATE = DIV_ERROR
- RUNNING = false
- }
-}
-
-M[OpCodes.MODG] = () => {
- POP_OS()
- D = RES
- POP_OS()
- E = RES
- A = HEAP[D + NUMBER_VALUE_SLOT]
- A = HEAP[E + NUMBER_VALUE_SLOT] % A
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === HEAP[E + TAG_SLOT]
- G = E && HEAP[D + TAG_SLOT] === NUMBER_TAG
- if (!G) {
- STATE = TYPE_ERROR
- RUNNING = false
- }
-}
-
-M[OpCodes.NEGG] = () => {
- POP_OS()
- D = RES
- A = -HEAP[D + NUMBER_VALUE_SLOT]
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === NUMBER_TAG
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'number'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = '-'
- RUNNING = false
- }
-}
-
-M[OpCodes.NOTG] = () => {
- POP_OS()
- D = RES
- A = !HEAP[D + BOOL_VALUE_SLOT]
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === BOOL_TAG
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'boolean'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = '!'
- RUNNING = false
- }
-}
-
-// for comparisons, assume both string or both nums
-M[OpCodes.LTG] = () => {
- POP_OS()
- D = RES
- POP_OS()
- E = RES
- A = HEAP[D + BOXED_VALUE_SLOT]
- A = HEAP[E + BOXED_VALUE_SLOT] < A
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === HEAP[E + TAG_SLOT]
- G = G && (HEAP[D + TAG_SLOT] === NUMBER_TAG || HEAP[D + TAG_SLOT] === STRING_TAG)
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'string and string or number and number'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[E + TAG_SLOT])} and ${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = '<'
- RUNNING = false
- }
-}
-
-M[OpCodes.GTG] = () => {
- POP_OS()
- D = RES
- POP_OS()
- E = RES
- A = HEAP[D + BOXED_VALUE_SLOT]
- A = HEAP[E + BOXED_VALUE_SLOT] > A
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === HEAP[E + TAG_SLOT]
- G = G && (HEAP[D + TAG_SLOT] === NUMBER_TAG || HEAP[D + TAG_SLOT] === STRING_TAG)
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'string and string or number and number'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[E + TAG_SLOT])} and ${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = '>'
- RUNNING = false
- }
-}
-
-M[OpCodes.LEG] = () => {
- POP_OS()
- D = RES
- POP_OS()
- E = RES
- A = HEAP[D + BOXED_VALUE_SLOT]
- A = HEAP[E + BOXED_VALUE_SLOT] <= A
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === HEAP[E + TAG_SLOT]
- G = G && (HEAP[D + TAG_SLOT] === NUMBER_TAG || HEAP[D + TAG_SLOT] === STRING_TAG)
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'string and string or number and number'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[E + TAG_SLOT])} and ${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = '<='
- RUNNING = false
- }
-}
-
-M[OpCodes.GEG] = () => {
- POP_OS()
- D = RES
- POP_OS()
- E = RES
- A = HEAP[D + BOXED_VALUE_SLOT]
- A = HEAP[E + BOXED_VALUE_SLOT] >= A
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === HEAP[E + TAG_SLOT]
- G = G && (HEAP[D + TAG_SLOT] === NUMBER_TAG || HEAP[D + TAG_SLOT] === STRING_TAG)
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'string and string or number and number'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[E + TAG_SLOT])} and ${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = '>='
- RUNNING = false
- }
-}
-
-// check type here as undefined and null need to be differentiated by nodes
-// unless if we add one more slot to undefined and null
-M[OpCodes.EQG] = () => {
- POP_OS()
- C = RES
- POP_OS()
- D = RES
- CHECK_EQUAL()
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.NEQG] = () => {
- POP_OS()
- C = RES
- POP_OS()
- D = RES
- CHECK_EQUAL()
- A = !A
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.NEWC] = () => {
- A = (P[PC][NEWC_ADDR_OFFSET] as Address)[ADDR_FUNC_INDEX_OFFSET]
- B = CLOSURE_NORMAL_TYPE
- NEW_FUNCTION()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.NEWA] = () => {
- NEW_ARRAY()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.LDLG] = () => {
- C = ENV
- A = HEAP[C + HEAP[C + FIRST_CHILD_SLOT] + P[PC][LD_ST_INDEX_OFFSET]]
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.STLG] = () => {
- POP_OS()
- C = ENV
- HEAP[C + HEAP[C + FIRST_CHILD_SLOT] + P[PC][LD_ST_INDEX_OFFSET]] = RES
- PC = PC + 1
-}
-
-M[OpCodes.LDPG] = () => {
- B = P[PC][LD_ST_ENV_OFFSET] // index of env to lookup
- C = ENV
- for (; B > 0; B = B - 1) {
- C = HEAP[C + PREVIOUS_ENV_SLOT]
- }
- A = HEAP[C + HEAP[C + FIRST_CHILD_SLOT] + P[PC][LD_ST_INDEX_OFFSET]]
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.STPG] = () => {
- POP_OS()
- B = P[PC][LD_ST_ENV_OFFSET] // index of env to lookup
- C = ENV
- for (; B > 0; B = B - 1) {
- C = HEAP[C + PREVIOUS_ENV_SLOT]
- }
- HEAP[C + HEAP[C + FIRST_CHILD_SLOT] + P[PC][LD_ST_INDEX_OFFSET]] = RES
- PC = PC + 1
-}
-
-M[OpCodes.LDAG] = () => {
- POP_OS()
- D = RES
- POP_OS()
- E = RES
- G = HEAP[E + TAG_SLOT] === ARRAY_TAG
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'array'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[E + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = 'array access'
- RUNNING = false
- return
- }
-
- A = HEAP[D + NUMBER_VALUE_SLOT]
- A = HEAP[E + ARRAY_VALUE_SLOT][A]
- if (A === undefined) {
- NEW_UNDEFINED()
- A = RES
- }
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === NUMBER_TAG
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'number'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = 'array index'
- RUNNING = false
- }
-}
-
-M[OpCodes.STAG] = () => {
- POP_OS()
- D = RES
- POP_OS()
- E = RES
- A = HEAP[E + NUMBER_VALUE_SLOT] // index
- POP_OS()
- F = RES
- G = HEAP[F + TAG_SLOT] === ARRAY_TAG
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'array'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[F + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = 'array access'
- RUNNING = false
- return
- }
- HEAP[F + ARRAY_VALUE_SLOT][A] = D
-
- // update array size
- D = HEAP[F + ARRAY_SIZE_SLOT]
- if (D < A + 1) {
- D = A + 1
- }
- HEAP[F + ARRAY_SIZE_SLOT] = D
- PC = PC + 1
-
- G = HEAP[E + TAG_SLOT] === NUMBER_TAG
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'number'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[E + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = 'array index'
- RUNNING = false
- }
-}
-
-M[OpCodes.BRT] = () => {
- POP_OS()
- A = HEAP[RES + BOOL_VALUE_SLOT]
- if (A) {
- PC = PC + (P[PC][BR_OFFSET] as number)
- } else {
- PC = PC + 1
- }
-}
-
-M[OpCodes.BRF] = () => {
- POP_OS()
- A = HEAP[RES + BOOL_VALUE_SLOT]
- if (!A) {
- PC = PC + (P[PC][BR_OFFSET] as number)
- } else {
- PC = PC + 1
- }
-}
-
-M[OpCodes.BR] = () => {
- PC = PC + (P[PC][BR_OFFSET] as number)
-}
-
-M[OpCodes.CALL] = () => {
- G = P[PC][CALL_NUM_ARGS_OFFSET] // lets keep number of arguments in G
- // we peek down OS to get the closure
- F = HEAP[OS + HEAP[OS + LAST_CHILD_SLOT] - G]
-
- E = HEAP[F + TAG_SLOT] === CLOSURE_TAG
- if (E) {
- J = NORMAL_CALL
- FUNCTION_CALL()
- } else {
- STATE = CALL_NON_FUNCTION_ERROR
- ERROR_MSG_ARGS[0] = convertToJsFormat(F)
- RUNNING = false
- }
-}
-
-M[OpCodes.CALLT] = () => {
- G = P[PC][CALLT_NUM_ARGS_OFFSET] // lets keep number of arguments in G
- // we peek down OS to get the closure
- F = HEAP[OS + HEAP[OS + LAST_CHILD_SLOT] - G]
-
- E = HEAP[F + TAG_SLOT] === CLOSURE_TAG
- if (E) {
- J = TAIL_CALL
- FUNCTION_CALL()
- } else {
- STATE = CALL_NON_FUNCTION_ERROR
- ERROR_MSG_ARGS[0] = convertToJsFormat(F)
- RUNNING = false
- }
-}
-
-M[OpCodes.CALLP] = () => {
- G = P[PC][CALLP_NUM_ARGS_OFFSET] // lets keep number of arguments in G
- F = P[PC][CALLP_ID_OFFSET] // lets keep primitiveCall Id in F
- F = HEAP[GLOBAL_ENV + HEAP[GLOBAL_ENV + FIRST_CHILD_SLOT] + F] // get closure
-
- E = HEAP[F + TAG_SLOT] === CLOSURE_TAG
- if (E) {
- J = PRIMITIVE_CALL
- FUNCTION_CALL()
- } else {
- STATE = CALL_NON_FUNCTION_ERROR
- ERROR_MSG_ARGS[0] = convertToJsFormat(F)
- RUNNING = false
- }
-}
-
-M[OpCodes.CALLTP] = () => {
- G = P[PC][CALLTP_NUM_ARGS_OFFSET] // lets keep number of arguments in G
- F = P[PC][CALLTP_ID_OFFSET] // lets keep primitiveCall Id in F
- F = HEAP[GLOBAL_ENV + HEAP[GLOBAL_ENV + FIRST_CHILD_SLOT] + F] // get closure
-
- E = HEAP[F + TAG_SLOT] === CLOSURE_TAG
- if (E) {
- J = PRIMITIVE_TAIL_CALL
- FUNCTION_CALL()
- } else {
- STATE = CALL_NON_FUNCTION_ERROR
- ERROR_MSG_ARGS[0] = convertToJsFormat(F)
- RUNNING = false
- }
-}
-
-M[OpCodes.CALLV] = () => {
- G = P[PC][CALLV_NUM_ARGS_OFFSET]
- F = P[PC][CALLV_ID_OFFSET]
-
- E = F < INTERNAL_FUNCTIONS.length
- if (E) {
- J = INTERNAL_CALL
- FUNCTION_CALL()
- } else {
- STATE = CALL_NON_FUNCTION_ERROR
- ERROR_MSG_ARGS[0] = convertToJsFormat(F)
- RUNNING = false
- }
-}
-
-M[OpCodes.CALLTV] = () => {
- G = P[PC][CALLTV_NUM_ARGS_OFFSET]
- F = P[PC][CALLTV_ID_OFFSET]
-
- E = F < INTERNAL_FUNCTIONS.length
- if (E) {
- J = INTERNAL_TAIL_CALL
- FUNCTION_CALL()
- } else {
- STATE = CALL_NON_FUNCTION_ERROR
- ERROR_MSG_ARGS[0] = convertToJsFormat(F)
- RUNNING = false
- }
-}
-
-M[OpCodes.RETG] = () => {
- POP_RTS()
- H = RES
- PC = HEAP[H + RTS_FRAME_PC_SLOT]
- ENV = HEAP[H + RTS_FRAME_ENV_SLOT]
- P = HEAP[H + RTS_FRAME_FUNC_INS_SLOT]
- POP_OS()
- A = RES
- OS = HEAP[H + RTS_FRAME_OS_SLOT]
- PUSH_OS()
-}
-
-M[OpCodes.DUP] = () => {
- POP_OS()
- A = RES
- PUSH_OS()
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.NEWENV] = () => {
- B = ENV
- A = P[PC][NEWENV_NUM_ARGS_OFFSET] // lets keep number of arguments in A
- NEW_ENVIRONMENT() // after this, RES is new env
- ENV = RES
- PC = PC + 1
-}
-
-M[OpCodes.POPENV] = () => {
- ENV = HEAP[ENV + PREVIOUS_ENV_SLOT] // restore to parent env
- PC = PC + 1
-}
-
-// for now, we treat all primitive functions as normal functions
-// until we find a way to deal with streams.
-// problem with streams is that they create nullary functions, which
-// will be called using CALL, and are considered normal functions by
-// the compiler and machine
-M[OpCodes.NEWCP] = () => {
- A = P[PC][NEWCP_ID_OFFSET]
- A = HEAP[GLOBAL_ENV + HEAP[GLOBAL_ENV + FIRST_CHILD_SLOT] + A]
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.NEWCV] = () => {
- A = P[PC][NEWCV_ID_OFFSET]
- B = CLOSURE_INTERNAL_TYPE
- NEW_FUNCTION()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-// all opcodes from here onwards are custom to this implementation (3 Concurrent)
-M[OpCodes.ARRAY_LEN] = () => {
- POP_OS()
- D = RES
- A = HEAP[D + ARRAY_SIZE_SLOT]
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
-
- G = HEAP[D + TAG_SLOT] === ARRAY_TAG
- if (!G) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'array'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = 'array_length'
- RUNNING = false
- }
-}
-
-M[OpCodes.DISPLAY] = () => {
- POP_OS()
- C = RES
- POP_OS()
- D = RES
- externalFunctions.get(OpCodes.DISPLAY)(convertToJsFormat(D), convertToJsFormat(C))
- A = D
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.DRAW_DATA] = () => {
- POP_OS()
- externalFunctions.get(OpCodes.DRAW_DATA)(...convertToJsFormat(RES))
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.ERROR] = () => {
- POP_OS()
- C = RES
- POP_OS()
- D = RES
- externalFunctions.get(OpCodes.ERROR)(convertToJsFormat(D), convertToJsFormat(C))
- // terminates so don't do anything else
- // A = D
- // PUSH_OS()
- // PC = PC + 1
-}
-
-M[OpCodes.IS_ARRAY] = () => {
- POP_OS()
- A = HEAP[RES + TAG_SLOT] === ARRAY_TAG
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.IS_BOOL] = () => {
- POP_OS()
- A = HEAP[RES + TAG_SLOT] === BOOL_TAG
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.IS_FUNC] = () => {
- POP_OS()
- A = HEAP[RES + TAG_SLOT] === CLOSURE_TAG
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.IS_NULL] = () => {
- POP_OS()
- A = HEAP[RES + TAG_SLOT] === NULL_TAG
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.IS_NUMBER] = () => {
- POP_OS()
- A = HEAP[RES + TAG_SLOT] === NUMBER_TAG
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.IS_STRING] = () => {
- POP_OS()
- A = HEAP[RES + TAG_SLOT] === STRING_TAG
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.IS_UNDEFINED] = () => {
- POP_OS()
- A = HEAP[RES + TAG_SLOT] === UNDEFINED_TAG
- NEW_BOOL()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.MATH_HYPOT] = () => {
- POP_OS()
- A = Math.hypot(...convertToJsFormat(RES))
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.STRINGIFY] = () => {
- POP_OS()
- A = stringify(convertToJsFormat(RES))
- NEW_STRING()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.PROMPT] = () => {
- POP_OS()
- A = externalFunctions.get(OpCodes.PROMPT)(convertToJsFormat(RES))
- NEW_STRING()
- A = RES
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.DISPLAY_LIST] = () => {
- POP_OS()
- C = RES
- POP_OS()
- D = RES
- externalFunctions.get(OpCodes.DISPLAY_LIST)(convertToJsFormat(D), convertToJsFormat(C))
- A = D
- PUSH_OS()
- PC = PC + 1
-}
-
-M[OpCodes.ARITY] = () => {
- POP_OS()
- D = RES
- G = HEAP[D + TAG_SLOT] === CLOSURE_TAG
- if (G) {
- H = HEAP[D + CLOSURE_FUNC_INDEX_SLOT]
- H = FUNC[H]
- A = H[FUNC_NUM_ARGS_OFFSET]
- if (A === VARARGS_NUM_ARGS) {
- A = 0
- }
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
- } else {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'closure'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = 'arity'
- RUNNING = false
- }
-}
-
-addPrimitiveOpCodeHandlers()
-
-// Internal functions. They are called directly in internal function calls
-// All internal functions should not use register J or K, and can find
-// the number of arguments in G. They should also not increment PC.
-
-// expects num args in G
-M[OpCodes.EXECUTE] = () => {
- I = G
- E = OS // we need the values in OS, so store in E first
- G = [OS, ENV, PC, P, RTS, TOP_RTS] // store current state first
- // Keep track of registers first to restore present state after saving threads
- for (; I > 0; I = I - 1) {
- RTS = []
- TOP_RTS = -1
- OS = E
- POP_OS()
- H = RES // store closure in H
- F = HEAP[H + CLOSURE_FUNC_INDEX_SLOT]
- F = FUNC[F] // store function header in F
- A = F[FUNC_MAX_STACK_SIZE_OFFSET]
- NEW_OS()
- OS = RES
- A = F[FUNC_ENV_SIZE_OFFSET]
- B = HEAP[H + CLOSURE_ENV_SLOT]
- NEW_ENVIRONMENT()
- ENV = RES
- P = F[FUNC_CODE_OFFSET]
- // enqueue to thread queue
- PC = 0
- NEW_THREAD()
- }
- ;[OS, ENV, PC, P, RTS, TOP_RTS] = G // restore state
-}
-
-M[OpCodes.TEST_AND_SET] = () => {
- POP_OS()
- D = RES // array
- E = HEAP[D + TAG_SLOT] === ARRAY_TAG
- if (!E) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'array'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = 'test_and_set'
- RUNNING = false
- } else {
- E = HEAP[D + ARRAY_VALUE_SLOT][0] // get old boolean value
- A = true
- NEW_BOOL()
- HEAP[D + ARRAY_VALUE_SLOT][0] = RES
- A = E
- PUSH_OS() // push old value to os
- }
-}
-
-M[OpCodes.CLEAR] = () => {
- POP_OS()
- D = RES // array
- E = HEAP[D + TAG_SLOT] === ARRAY_TAG
- if (!E) {
- STATE = TYPE_ERROR
- ERROR_MSG_ARGS[0] = 'array'
- ERROR_MSG_ARGS[1] = `${node_kind(HEAP[D + TAG_SLOT])}`
- ERROR_MSG_ARGS[2] = 'clear'
- RUNNING = false
- } else {
- A = false
- NEW_BOOL()
- HEAP[D + ARRAY_VALUE_SLOT][0] = RES
- }
-}
-
-// called whenever the machine is first run
-function INITIALIZE() {
- D = FUNC[PROG[0]] // put function header in D
- A = D[FUNC_MAX_STACK_SIZE_OFFSET]
- P = D[FUNC_CODE_OFFSET]
- NEW_OS()
- OS = RES
- A = D[FUNC_ENV_SIZE_OFFSET]
- B = NIL
- NEW_ENVIRONMENT()
- ENV = RES
- GLOBAL_ENV = ENV
- PC = 0
-}
-
-// called during concurrent execution
-function RUN_INSTRUCTION() {
- if (TOP_RTS > -1 || P[PC][INS_OPCODE_OFFSET] !== OpCodes.RETG) {
- // execute normally
- if (M[P[PC][INS_OPCODE_OFFSET]] === undefined) {
- throw Error('unknown op-code: ' + P[PC][INS_OPCODE_OFFSET])
- }
- M[P[PC][INS_OPCODE_OFFSET]]()
- TO = TO - 1
- } else {
- // end of current thread, try to setup another thread
- DELETE_CURRENT_THREAD()
- GET_NUM_IDLE_THREADS()
- if (RES === 0) {
- // end if no more threads
- RUNNING = false
- } else {
- // setup next thread
- RUN_THREAD()
- }
- }
-}
-
-function TIMEOUT_THREAD() {
- // enqueue to thread queue
- PAUSE_THREAD()
- RUN_THREAD()
-}
-
-function run(): any {
- const MAX_TIME = JSSLANG_PROPERTIES.maxExecTime
- const startTime = Date.now()
-
- // startup
- INITIALIZE()
-
- while (RUNNING) {
- // infinite loop protection
- if (Date.now() - startTime > MAX_TIME) {
- throw new PotentialInfiniteLoopError(locationDummyNode(-1, -1, null), MAX_TIME)
- }
-
- if (TO > 0) {
- // show_registers("run loop");
- // show_heap("run loop");
- // show_executing('')
- RUN_INSTRUCTION()
- } else if (TO === 0) {
- // when exhausted time quanta
- TIMEOUT_THREAD()
- } else {
- throw Error('TO cannot be negative')
- }
- }
-
- // handle errors
- if (STATE !== NORMAL) {
- throw Error('execution aborted: ' + getErrorType())
- }
-
- POP_OS()
- // show_heap_value(RES)
- // return convertToJsFormat(RES)
- // Source 3 Concurrent programs do not return anything.
- return 'all threads terminated'
-}
-
-function getErrorType(): string {
- switch (STATE) {
- case DIV_ERROR:
- return 'division by 0'
- case TYPE_ERROR:
- // 0: expected types
- // 1: received types
- // 2: operator
- return `Expected ${ERROR_MSG_ARGS[0]}, got ${ERROR_MSG_ARGS[1]} for ${ERROR_MSG_ARGS[2]}.`
- case NUM_ARGS_ERROR:
- return `Expected ${ERROR_MSG_ARGS[0]} arguments, but got ${ERROR_MSG_ARGS[1]}.`
- case CALL_NON_FUNCTION_ERROR:
- return `calling non-function value ${ERROR_MSG_ARGS[0]}.`
- default:
- throw Error('invalid error type')
- }
-}
-
-function convertToJsFormat(node: number, refs?: Map<number, any>): any {
- if (refs !== undefined && refs.has(node)) {
- return refs.get(node)
- }
- const kind = node_kind(HEAP[node + TAG_SLOT])
- switch (kind) {
- case 'undefined':
- return undefined
-
- case 'null':
- return null
-
- case 'number':
- case 'string':
- case 'boolean':
- return HEAP[node + BOXED_VALUE_SLOT]
-
- case 'array': {
- if (refs === undefined) {
- refs = new Map<number, any>()
- }
- const arr: number[] = HEAP[node + BOXED_VALUE_SLOT]
- const res: any[] = []
- refs.set(node, res)
- for (let i = 0; i < arr.length; i++) {
- res[i] = convertToJsFormat(arr[i], refs)
- }
- return res
- }
- case 'closure':
- return '<Function>'
- default:
- throw Error('Encountered unexpressible type: ' + kind)
- }
-}
-
-// if program has primitive calls, prelude must be included.
-// this implementation also assumes a correct program, and does not
-// currently check for type correctness
-// an incorrect program will have undefined behaviors
-export function runWithProgram(p: Program, context: Context): any {
- PROG = p
- FUNC = PROG[1] // list of SVMFunctions
- P = []
- PC = -1
- HEAP = []
- FREE = 0
- GLOBAL_ENV = NIL
- ENV = NIL
- OS = -Infinity
- RES = -Infinity
- RTS = []
- TO = 0
- TOP_RTS = -1
- STATE = NORMAL
- RUNNING = true
- ERROR_MSG_ARGS = []
-
- INIT_SCHEDULER()
-
- A = 0
- B = 0
- C = 0
- D = 0
- E = 0
- F = 0
- G = 0
- H = 0
- I = 0
- J = 0
- K = 0
-
- // setup externalBuiltins
- // certain functions are imported from cadet-frontend
- // so import them first every time
- const externals = context.nativeStorage.builtins
- if (externals.size > 0) {
- EXTERNAL_PRIMITIVES.forEach(func => extractExternalBuiltin(func, externals))
- }
-
- return run()
-}
-
-function addPrimitiveOpCodeHandlers() {
- function addNullaryHandler(opcode: number, f: () => number) {
- M[opcode] = () => {
- A = f()
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
- }
- }
- function addUnaryHandler(opcode: number, f: (x: number) => number) {
- M[opcode] = () => {
- POP_OS()
- A = HEAP[RES + NUMBER_VALUE_SLOT]
- A = f(A)
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
- }
- }
- // string as well due to parseInt. Only works due to current
- // representation of strings. Must change if the machine changes
- // to a more authentic representation of strings
- function addBinaryHandler(opcode: number, f: (x: number | string, y: number) => number) {
- M[opcode] = () => {
- POP_OS()
- C = HEAP[RES + NUMBER_VALUE_SLOT]
- POP_OS()
- D = HEAP[RES + BOXED_VALUE_SLOT]
- A = f(D, C)
- NEW_NUMBER()
- A = RES
- PUSH_OS()
- PC = PC + 1
- }
- }
-
- NULLARY_PRIMITIVES.forEach(func => {
- if (func[2]) addNullaryHandler(func[1], func[2])
- })
- UNARY_PRIMITIVES.forEach(func => {
- if (func[2]) addUnaryHandler(func[1], func[2])
- })
- BINARY_PRIMITIVES.concat([
- ['', OpCodes.MATH_MAX, Math.max], // only want the handler
- ['', OpCodes.MATH_MIN, Math.min]
- ]).forEach(func => {
- if (func[2]) addBinaryHandler(func[1], func[2])
- })
-}
-
-const externalFunctions = new Map<number, any>()
-function extractExternalBuiltin(func: [string, number], externals: Map<string, any>) {
- const name = func[0]
- const opcode = func[1]
- externalFunctions.set(opcode, externals.get(name))
-}
From 81f19d0141290a2276bb784de50f951883732682 Mon Sep 17 00:00:00 2001
From: "DESKTOP-G08HS3B\\Lee Yi" <leeyi45@gmail.com>
Date: Mon, 3 Mar 2025 02:08:04 -0500
Subject: [PATCH 02/17] Run format
---
src/createContext.ts | 2 +-
src/index.ts | 2 +-
src/repl/__tests__/main.ts | 2 +-
src/repl/__tests__/svmc.ts | 2 +-
src/repl/__tests__/transpiler.ts | 2 +-
src/repl/__tests__/utils.ts | 2 +-
src/repl/index.ts | 2 +-
src/repl/main.ts | 2 +-
src/repl/svmc.ts | 2 +-
src/repl/transpiler.ts | 5 +----
src/runner/sourceRunner.ts | 5 ++++-
src/types.ts | 2 +-
src/utils/testing/misc.ts | 2 +-
13 files changed, 16 insertions(+), 16 deletions(-)
diff --git a/src/createContext.ts b/src/createContext.ts
index 8525471ff..ac4a8ece0 100644
--- a/src/createContext.ts
+++ b/src/createContext.ts
@@ -119,7 +119,7 @@ const createEmptyDebugger = () => ({
state: {
it: (function* (): any {
return
- })(),
+ })()
}
})
diff --git a/src/index.ts b/src/index.ts
index 799bfa19b..46028b898 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -253,7 +253,7 @@ export async function runFilesInContext(
export function resume(result: Result): Finished | ResultError | Promise<Result> {
if (result.status === 'finished' || result.status === 'error') {
return result
- }
+ }
const value = resumeEvaluate(result.context)
return CSEResultPromise(result.context, value)
}
diff --git a/src/repl/__tests__/main.ts b/src/repl/__tests__/main.ts
index 6477a99a0..421e136e8 100644
--- a/src/repl/__tests__/main.ts
+++ b/src/repl/__tests__/main.ts
@@ -17,4 +17,4 @@ describe('Make sure each subcommand can be run', () => {
)
}
)
-})
\ No newline at end of file
+})
diff --git a/src/repl/__tests__/svmc.ts b/src/repl/__tests__/svmc.ts
index 8ec41b934..80bc98884 100644
--- a/src/repl/__tests__/svmc.ts
+++ b/src/repl/__tests__/svmc.ts
@@ -107,4 +107,4 @@ describe('Test output options', () => {
expect(contents).toMatchSnapshot()
})
})
-})
\ No newline at end of file
+})
diff --git a/src/repl/__tests__/transpiler.ts b/src/repl/__tests__/transpiler.ts
index 34862d6d1..753f98cb3 100644
--- a/src/repl/__tests__/transpiler.ts
+++ b/src/repl/__tests__/transpiler.ts
@@ -63,4 +63,4 @@ test('pretranspile option', async () => {
const [[fileName, contents]] = mockedWriteFile.mock.calls
expect(fileName).toEqual('out.js')
expect(contents).toEqual('1 + 1;\n')
-})
\ No newline at end of file
+})
diff --git a/src/repl/__tests__/utils.ts b/src/repl/__tests__/utils.ts
index 5cc73689e..fb944018e 100644
--- a/src/repl/__tests__/utils.ts
+++ b/src/repl/__tests__/utils.ts
@@ -35,4 +35,4 @@ export function expectWritten(f: (contents: string) => any) {
expect(f).toHaveBeenCalledTimes(1)
const [[contents]] = asMockedFunc(f).mock.calls
return expect(contents)
-}
\ No newline at end of file
+}
diff --git a/src/repl/index.ts b/src/repl/index.ts
index 14c3f211a..a1c7aefd7 100644
--- a/src/repl/index.ts
+++ b/src/repl/index.ts
@@ -1,4 +1,4 @@
#!/bin/env/node
import { getMainCommand } from './main'
-getMainCommand().parseAsync()
\ No newline at end of file
+getMainCommand().parseAsync()
diff --git a/src/repl/main.ts b/src/repl/main.ts
index 3bfcbdf80..6ca6834ae 100644
--- a/src/repl/main.ts
+++ b/src/repl/main.ts
@@ -8,4 +8,4 @@ export const getMainCommand = () =>
new Command()
.addCommand(getSVMCCommand())
.addCommand(getTranspilerCommand())
- .addCommand(getReplCommand(), { isDefault: true })
\ No newline at end of file
+ .addCommand(getReplCommand(), { isDefault: true })
diff --git a/src/repl/svmc.ts b/src/repl/svmc.ts
index e285a01cf..5cba0dd37 100644
--- a/src/repl/svmc.ts
+++ b/src/repl/svmc.ts
@@ -103,4 +103,4 @@ strings containing the names of the VM-internal functions.`
const outputFileName = opts.out ?? `${basename(inputFile, extToRemove)}${ext}`
await fs.writeFile(outputFileName, output)
console.log(`Output written to ${outputFileName}`)
- })
\ No newline at end of file
+ })
diff --git a/src/repl/transpiler.ts b/src/repl/transpiler.ts
index 3ab8c9708..a65edfc30 100644
--- a/src/repl/transpiler.ts
+++ b/src/repl/transpiler.ts
@@ -20,10 +20,7 @@ export const getTranspilerCommand = () =>
new Command('transpiler')
.addOption(getVariantOption(Variant.DEFAULT, [Variant.DEFAULT, Variant.NATIVE]))
.addOption(getChapterOption(Chapter.SOURCE_4, chapterParser))
- .option(
- '-p, --pretranspile',
- "only pretranspile and don't perform Source -> JS transpilation"
- )
+ .option('-p, --pretranspile', "only pretranspile and don't perform Source -> JS transpilation")
.option('-o, --out <outFile>', 'Specify a file to write to')
.argument('<filename>')
.action(async (fileName, opts) => {
diff --git a/src/runner/sourceRunner.ts b/src/runner/sourceRunner.ts
index 3795a3d1e..99ed0445a 100644
--- a/src/runner/sourceRunner.ts
+++ b/src/runner/sourceRunner.ts
@@ -223,7 +223,10 @@ async function sourceRunner(
return runCSEMachine(program, context, theOptions)
}
- assert(context.executionMethod !== 'auto', 'Execution method should have been properly determined!')
+ assert(
+ context.executionMethod !== 'auto',
+ 'Execution method should have been properly determined!'
+ )
return runNative(program, context, theOptions)
}
diff --git a/src/types.ts b/src/types.ts
index b68dcd46b..4473caa88 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -498,4 +498,4 @@ export type RecursivePartial<T> = T extends Array<any>
}>
: T
-export type NodeTypeToNode<T extends Node['type']> = Extract<Node, { type: T }>
\ No newline at end of file
+export type NodeTypeToNode<T extends Node['type']> = Extract<Node, { type: T }>
diff --git a/src/utils/testing/misc.ts b/src/utils/testing/misc.ts
index 4ca9fc519..c6e0cc1e7 100644
--- a/src/utils/testing/misc.ts
+++ b/src/utils/testing/misc.ts
@@ -24,4 +24,4 @@ export function expectNodeType<T extends Node['type']>(
node: Node
): asserts node is NodeTypeToNode<T> {
expect(node.type).toEqual(typeStr)
-}
\ No newline at end of file
+}
From 423bff4ac49445f65384ee37e619f57675da2360 Mon Sep 17 00:00:00 2001
From: "DESKTOP-G08HS3B\\Lee Yi" <leeyi45@gmail.com>
Date: Mon, 3 Mar 2025 02:19:31 -0500
Subject: [PATCH 03/17] Remove interpreter
---
.../__snapshots__/interpreter-errors.ts.snap | 1106 ----------------
.../__tests__/interpreter-errors.ts | 1127 -----------------
src/interpreter/closure.ts | 138 --
src/interpreter/interpreter.ts | 858 -------------
4 files changed, 3229 deletions(-)
delete mode 100644 src/interpreter/__tests__/__snapshots__/interpreter-errors.ts.snap
delete mode 100644 src/interpreter/__tests__/interpreter-errors.ts
delete mode 100644 src/interpreter/closure.ts
delete mode 100644 src/interpreter/interpreter.ts
diff --git a/src/interpreter/__tests__/__snapshots__/interpreter-errors.ts.snap b/src/interpreter/__tests__/__snapshots__/interpreter-errors.ts.snap
deleted file mode 100644
index 4f232772a..000000000
--- a/src/interpreter/__tests__/__snapshots__/interpreter-errors.ts.snap
+++ /dev/null
@@ -1,1106 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Access local property: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "({a: 0})[\\"a\\"];",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 0,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins don't create additional errors when it's not their fault: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x) {
- return a;
-}
-map(f, list(1, 2));",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Name a not declared.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Cascading js errors work properly 1: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function make_alternating_stream(stream) {
- return pair(head(stream), () => make_alternating_stream(
- negate_whole_stream(
- stream_tail(stream))));
-}
-
-function negate_whole_stream(stream) {
- return pair(-head(stream), () => negate_whole_stream(stream_tail(stream)));
-}
-
-const ones = pair(1, () => ones);
-eval_stream(make_alternating_stream(enum_stream(1, 9)), 10);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 8: Error: head(xs) expects a pair as argument xs, but encountered null",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Cascading js errors work properly: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function h(p) {
- return head(p);
-}
-
-h(null);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Error: head(xs) expects a pair as argument xs, but encountered null",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when accessing inherited property of object: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "({}).valueOf;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Cannot read inherited property valueOf of {}.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when assigning to builtin - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-map = 5;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 0: Cannot assign new value to constant map.
-As map was declared as a constant, its value cannot be changed. You will have to declare a new variable.
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when assigning to builtin - verbose: expectParsedError 2`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-undefined = 5;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 0: Cannot assign new value to constant undefined.
-As undefined was declared as a constant, its value cannot be changed. You will have to declare a new variable.
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when assigning to builtin: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "map = 5;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Cannot assign new value to constant map.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when assigning to builtin: expectParsedError 2`] = `
-Object {
- "alertResult": Array [],
- "code": "undefined = 5;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Cannot assign new value to constant undefined.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function in tail call with too many arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-const g = () => 1;
-const f = x => g(x);
-f(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 15: Expected 0 arguments, but got 1.
-Try calling function g again, but with 0 arguments instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function in tail call with too many arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const g = () => 1;
-const f = x => g(x);
-f(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 0 arguments, but got 1.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function with too few arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- const f = x => x;
- f();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 2: Expected 1 arguments, but got 0.
-Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function with too few arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = x => x;
-f();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 1 arguments, but got 0.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function with too many arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- const f = x => x;
- f(1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 2: Expected 1 arguments, but got 2.
-Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function with too many arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = x => x;
-f(1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 1 arguments, but got 2.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling builtin function in with too few arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "parse_int(\\"\\");",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected 2 arguments, but got 1.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling builtin function in with too many arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number(1, 2, 3);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected 1 arguments, but got 3.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function from member expression with too many arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- const f = [x => x];
- f[0](1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 2: Expected 1 arguments, but got 2.
-Try calling function f[0] again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function from member expression with too many arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = [x => x];
-f[0](1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 1 arguments, but got 2.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function with too few arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- function f(x) {
- return x;
- }
- f();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 5, Column 2: Expected 1 arguments, but got 0.
-Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function with too few arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x) {
- return x;
-}
-f();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 4: Expected 1 arguments, but got 0.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function with too many arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- function f(x) {
- return x;
- }
- f(1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 5, Column 2: Expected 1 arguments, but got 2.
-Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function with too many arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x) {
- return x;
-}
-f(1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 4: Expected 1 arguments, but got 2.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value "string" - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- 'string'();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: Calling non-function value \\"string\\".
-Because \\"string\\" is not a function, you cannot run \\"string\\"().
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value "string": expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "'string'();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value \\"string\\".",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value 0 - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- 0();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: Calling non-function value 0.
-Because 0 is not a function, you cannot run 0(). If you were planning to perform multiplication by 0, you need to use the * operator.
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value 0: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "0();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value 0.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value array - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-[1]();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 0: Calling non-function value [1].
-Because [1] is not a function, you cannot run [1]().
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value array: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "[1]();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value [1].",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value null - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- null();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: null literals are not allowed.
-They're not part of the Source §1 specs.
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value null: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "null();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: null literals are not allowed.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value object - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-({a: 1})();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 0: Calling non-function value {\\"a\\": 1}.
-Because {\\"a\\": 1} is not a function, you cannot run {\\"a\\": 1}().
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value object - verbose: expectParsedError 2`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-({a: 1})();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 0: Calling non-function value {\\"a\\": 1}.
-Because {\\"a\\": 1} is not a function, you cannot run {\\"a\\": 1}().
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value object: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "({a: 1})();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value {\\"a\\": 1}.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value true - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- true();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: Calling non-function value true.
-Because true is not a function, you cannot run true().
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value true: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "true();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value true.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value undefined - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- undefined();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: Calling non-function value undefined.
-Because undefined is not a function, you cannot run undefined().
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value undefined with arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- undefined(1, true);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: Calling non-function value undefined.
-Because undefined is not a function, you cannot run undefined(1, true).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value undefined with arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "undefined(1, true);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value undefined.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value undefined: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "undefined();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value undefined.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring const after function --verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-function f() {}
-const f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 6: SyntaxError: Identifier 'f' has already been declared (3:6)
-There is a syntax error in your program
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring const after function: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f() {}
-const f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:6)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring constant as variable: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = x => x;
-let f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:4)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring constant: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = x => x;
-const f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:6)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after const --verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-const f = x => x;
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 9: SyntaxError: Identifier 'f' has already been declared (3:9)
-There is a syntax error in your program
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after const: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = x => x;
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:9)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after function --verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-function f() {}
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 9: SyntaxError: Identifier 'f' has already been declared (3:9)
-There is a syntax error in your program
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after function: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f() {}
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:9)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after let --verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-let f = x => x;
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 9: SyntaxError: Identifier 'f' has already been declared (3:9)
-There is a syntax error in your program
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after let: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let f = x => x;
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:9)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring let after function --verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-function f() {}
-let f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 4: SyntaxError: Identifier 'f' has already been declared (3:4)
-There is a syntax error in your program
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring let after function: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f() {}
-let f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:4)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring variable as constant: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let f = x => x;
-const f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:6)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring variable: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let f = x => x;
-let f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:4)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error with too few arguments passed to rest parameters: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function rest(a, b, ...c) {}
-rest(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 2 or more arguments, but got 1.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error with too many arguments passed to math_sin: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "math_sin(7,8);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected 1 arguments, but got 2.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Nice errors when errors occur inside builtins: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "parse_int(\\"10\\");",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected 2 arguments, but got 1.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Nice errors when errors occur inside builtins: expectParsedError 2`] = `
-Object {
- "alertResult": Array [],
- "code": "parse(\\"'\\");",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: ParseError: SyntaxError: Unterminated string constant (1:0)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No error when calling display function in with variable arguments: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display(1);
-display(1, \\"test\\");",
- "displayResult": Array [
- "1",
- "test 1",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No error when calling list function in with variable arguments: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "list();
-list(1);
-list(1, 2, 3);
-list(1, 2, 3, 4, 5, 6, 6);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- 1,
- Array [
- 2,
- Array [
- 3,
- Array [
- 4,
- Array [
- 5,
- Array [
- 6,
- Array [
- 6,
- null,
- ],
- ],
- ],
- ],
- ],
- ],
- ],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No error when calling math_max function in with variable arguments: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "math_max();
-math_max(1, 2);
-math_max(1, 2, 3);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 3,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No error when calling math_min function in with variable arguments: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "math_min();
-math_min(1, 2);
-math_min(1, 2, 3);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No error when calling stringify function in with variable arguments: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(1, 2);
-stringify(1, 2, 3);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "1",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Type error when accessing property of function: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f() {
- return 1;
-}
-f.prototype;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 4: Expected object or array, got function.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Type error when accessing property of null: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "null.prop;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected object or array, got null.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Type error when accessing property of string: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "'hi'.length;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected object or array, got string.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Type error when assigning property of function: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f() {
- return 1;
-}
-f.prop = 5;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 4: Expected object or array, got function.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Type error when assigning property of string: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "'hi'.prop = 5;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected object or array, got string.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Type error with <number> * <nonnumber>, error line at <number>, not <nonnumber>: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "12
-*
-'string';",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected number on right hand side of operation, got string.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Type error with non boolean in if statement, error line at if statement, not at 1: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "if (
-1
-) {
- 2;
-} else {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected boolean as condition, got number.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Undefined variable error is thrown - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-im_undefined;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 0: Name im_undefined not declared.
-Before you can read the value of im_undefined, you need to declare it as a variable or a constant. You can do this using the let or const keywords.
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Undefined variable error is thrown: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "im_undefined;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Name im_undefined not declared.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/interpreter/__tests__/interpreter-errors.ts b/src/interpreter/__tests__/interpreter-errors.ts
deleted file mode 100644
index c12848a00..000000000
--- a/src/interpreter/__tests__/interpreter-errors.ts
+++ /dev/null
@@ -1,1127 +0,0 @@
-// import type { FunctionLike, MockedFunction } from 'jest-mock'
-
-/* tslint:disable:max-line-length */
-// import { memoizedGetModuleManifest } from '../../modules/moduleLoader'
-import { Chapter } from '../../types'
-import { stripIndent } from '../../utils/formatters'
-import {
- expectDifferentParsedErrors,
- expectParsedError,
- expectParsedErrorNoSnapshot,
- expectResult
-} from '../../utils/testing'
-
-jest.mock('../../modules/loader/loaders')
-
-// const asMock = <T extends FunctionLike>(func: T) => func as MockedFunction<T>
-// const mockedModuleFile = asMock(memoizedGetModuleFile)
-
-const undefinedVariable = stripIndent`
-im_undefined;
-`
-const undefinedVariableVerbose = stripIndent`
-"enable verbose";
-im_undefined;
-`
-
-test('Undefined variable error is thrown', () => {
- return expectParsedError(undefinedVariable).toMatchInlineSnapshot(
- `"Line 1: Name im_undefined not declared."`
- )
-})
-
-test('Undefined variable error is thrown - verbose', () => {
- return expectParsedError(undefinedVariableVerbose).toMatchInlineSnapshot(`
- "Line 2, Column 0: Name im_undefined not declared.
- Before you can read the value of im_undefined, you need to declare it as a variable or a constant. You can do this using the let or const keywords.
- "
- `)
-})
-
-test('Undefined variable error message differs from verbose version', () => {
- return expectDifferentParsedErrors(undefinedVariable, undefinedVariableVerbose).toBe(undefined)
-})
-
-const assignToBuiltin = stripIndent`
-map = 5;
-`
-
-const assignToBuiltinVerbose = stripIndent`
- "enable verbose";
- map = 5;
-`
-
-test('Error when assigning to builtin', () => {
- return expectParsedError(assignToBuiltin, { chapter: Chapter.SOURCE_3 }).toMatchInlineSnapshot(
- `"Line 1: Cannot assign new value to constant map."`
- )
-})
-
-test('Error when assigning to builtin - verbose', () => {
- return expectParsedError(assignToBuiltinVerbose, { chapter: Chapter.SOURCE_3 })
- .toMatchInlineSnapshot(`
- "Line 2, Column 0: Cannot assign new value to constant map.
- As map was declared as a constant, its value cannot be changed. You will have to declare a new variable.
- "
- `)
-})
-
-test('Assigning to builtin error message differs from verbose version', () => {
- return expectDifferentParsedErrors(assignToBuiltin, assignToBuiltinVerbose).toBe(undefined)
-})
-
-const assignToBuiltin1 = stripIndent`
-undefined = 5;
-`
-
-const assignToBuiltinVerbose1 = stripIndent`
- "enable verbose";
- undefined = 5;
-`
-
-test('Error when assigning to builtin', () => {
- return expectParsedError(assignToBuiltin1, { chapter: Chapter.SOURCE_3 }).toMatchInlineSnapshot(
- `"Line 1: Cannot assign new value to constant undefined."`
- )
-})
-
-test('Error when assigning to builtin - verbose', () => {
- return expectParsedError(assignToBuiltinVerbose1, { chapter: Chapter.SOURCE_3 })
- .toMatchInlineSnapshot(`
- "Line 2, Column 0: Cannot assign new value to constant undefined.
- As undefined was declared as a constant, its value cannot be changed. You will have to declare a new variable.
- "
- `)
-})
-
-test('Assigning to builtin error message differs from verbose version', () => {
- return expectDifferentParsedErrors(assignToBuiltin1, assignToBuiltinVerbose1).toBe(undefined)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when assigning to property on undefined', () => {
- return expectParsedError(
- stripIndent`
- undefined.prop = 123;
- `,
- { chapter: Chapter.LIBRARY_PARSER }
- ).toMatchInlineSnapshot(`"Line 1: Cannot assign property prop of undefined"`)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when assigning to property on variable with value undefined', () => {
- return expectParsedError(
- stripIndent`
- const u = undefined;
- u.prop = 123;
- `,
- { chapter: Chapter.LIBRARY_PARSER }
- ).toMatchInlineSnapshot(`"Line 2: Cannot assign property prop of undefined"`)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when deeply assigning to property on variable with value undefined', () => {
- return expectParsedError(
- stripIndent`
- const u = undefined;
- u.prop.prop = 123;
- `,
- { chapter: Chapter.LIBRARY_PARSER }
- ).toMatchInlineSnapshot(`"Line 2: Cannot read property prop of undefined"`)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when accessing property on undefined', () => {
- return expectParsedError(
- stripIndent`
- undefined.prop;
- `,
- { chapter: Chapter.LIBRARY_PARSER }
- ).toMatchInlineSnapshot(`"Line 1: Cannot read property prop of undefined"`)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when deeply accessing property on undefined', () => {
- return expectParsedError(
- stripIndent`
- undefined.prop.prop;
- `,
- { chapter: Chapter.LIBRARY_PARSER }
- ).toMatchInlineSnapshot(`"Line 1: Cannot read property prop of undefined"`)
-})
-
-test('Nice errors when errors occur inside builtins', () => {
- return expectParsedError(
- stripIndent`
- parse_int("10");
- `,
- { chapter: Chapter.SOURCE_4 }
- ).toMatchInlineSnapshot(`"Line 1: Expected 2 arguments, but got 1."`)
-})
-
-test('Nice errors when errors occur inside builtins', () => {
- return expectParsedError(
- stripIndent`
- parse("'");
- `,
- { chapter: Chapter.SOURCE_4 }
- ).toMatchInlineSnapshot(`"Line 1: ParseError: SyntaxError: Unterminated string constant (1:0)"`)
-})
-
-test("Builtins don't create additional errors when it's not their fault", () => {
- return expectParsedError(
- stripIndent`
- function f(x) {
- return a;
- }
- map(f, list(1, 2));
- `,
- { chapter: Chapter.SOURCE_4 }
- ).toMatchInlineSnapshot(`"Line 2: Name a not declared."`)
-})
-
-test('Infinite recursion with a block bodied function', () => {
- return expectParsedErrorNoSnapshot(
- stripIndent`
- function i(n) {
- return n === 0 ? 0 : 1 + i(n-1);
- }
- i(1000);
- `,
- { chapter: Chapter.SOURCE_4 }
- ).toEqual(expect.stringMatching(/Maximum call stack size exceeded\n *(i\(\d*\)[^i]{2,4}){3}/))
-}, 15000)
-
-test('Infinite recursion with function calls in argument', () => {
- return expectParsedErrorNoSnapshot(
- stripIndent`
- function i(n, redundant) {
- return n === 0 ? 0 : 1 + i(n-1, r());
- }
- function r() {
- return 1;
- }
- i(1000, 1);
- `,
- { chapter: Chapter.SOURCE_4 }
- ).toEqual(
- expect.stringMatching(/Maximum call stack size exceeded\n *(i\(\d*, 1\)[^i]{2,4}){2}[ir]/)
- )
-}, 10000)
-
-test('Infinite recursion of mutually recursive functions', () => {
- return expectParsedErrorNoSnapshot(
- stripIndent`
- function f(n) {
- return n === 0 ? 0 : 1 + g(n - 1);
- }
- function g(n) {
- return 1 + f(n);
- }
- f(1000);
- `,
- { chapter: Chapter.SOURCE_4 }
- ).toEqual(
- expect.stringMatching(
- /Maximum call stack size exceeded\n([^f]*f[^g]*g[^f]*f|[^g]*g[^f]*f[^g]*g)/
- )
- )
-})
-
-const callingNonFunctionValueUndefined = stripIndent`
-undefined();
-`
-
-const callingNonFunctionValueUndefinedVerbose = stripIndent`
-"enable verbose";
- undefined();
-`
-// should not be different when error passing is fixed
-test('Error when calling non function value undefined', () => {
- return expectParsedError(callingNonFunctionValueUndefined, {
- native: true
- }).toMatchInlineSnapshot(`"Line 1: Calling non-function value undefined."`)
-})
-
-test('Error when calling non function value undefined - verbose', () => {
- return expectParsedError(callingNonFunctionValueUndefinedVerbose).toMatchInlineSnapshot(`
- "Line 2, Column 2: Calling non-function value undefined.
- Because undefined is not a function, you cannot run undefined().
- "
- `)
-})
-
-test('Calling non function value undefined error message differs from verbose version', () => {
- return expectDifferentParsedErrors(
- callingNonFunctionValueUndefined,
- callingNonFunctionValueUndefinedVerbose
- ).toBe(undefined)
-})
-
-const callingNonFunctionValueUndefinedArgs = stripIndent`
-undefined(1, true);
-`
-
-const callingNonFunctionValueUndefinedArgsVerbose = stripIndent`
-"enable verbose";
- undefined(1, true);
-`
-// should not be different when error passing is fixed
-test('Error when calling non function value undefined with arguments', () => {
- return expectParsedError(callingNonFunctionValueUndefinedArgs, {
- native: false
- }).toMatchInlineSnapshot(`"Line 1: Calling non-function value undefined."`)
-})
-
-test('Error when calling non function value undefined with arguments - verbose', () => {
- return expectParsedError(callingNonFunctionValueUndefinedArgsVerbose).toMatchInlineSnapshot(`
- "Line 2, Column 2: Calling non-function value undefined.
- Because undefined is not a function, you cannot run undefined(1, true).
- "
- `)
-})
-
-test('Calling non function value undefined with arguments error message differs from verbose version', () => {
- return expectDifferentParsedErrors(
- callingNonFunctionValueUndefinedArgs,
- callingNonFunctionValueUndefinedArgsVerbose
- ).toBe(undefined)
-})
-
-const callingNonFunctionValueNull = stripIndent`
-null();
-`
-
-const callingNonFunctionValueNullVerbose = stripIndent`
-"enable verbose";
- null();
-`
-
-test('Error when calling non function value null', () => {
- return expectParsedError(callingNonFunctionValueNull).toMatchInlineSnapshot(
- `"Line 1: null literals are not allowed."`
- )
-})
-
-test('Error when calling non function value null - verbose', () => {
- return expectParsedError(callingNonFunctionValueNullVerbose).toMatchInlineSnapshot(`
- "Line 2, Column 2: null literals are not allowed.
- They're not part of the Source §1 specs.
- "
- `)
-})
-
-test('Calling non function value null error message differs from verbose version', () => {
- return expectDifferentParsedErrors(
- callingNonFunctionValueNull,
- callingNonFunctionValueNullVerbose
- ).toBe(undefined)
-})
-
-const callingNonFunctionValueTrue = stripIndent`
-true();
-`
-const callingNonFunctionValueTrueVerbose = stripIndent`
-"enable verbose";
- true();
-`
-
-test('Error when calling non function value true', () => {
- return expectParsedError(callingNonFunctionValueTrue, { native: true }).toMatchInlineSnapshot(
- `"Line 1: Calling non-function value true."`
- )
-})
-
-test('Error when calling non function value true - verbose', () => {
- return expectParsedError(callingNonFunctionValueTrueVerbose).toMatchInlineSnapshot(`
- "Line 2, Column 2: Calling non-function value true.
- Because true is not a function, you cannot run true().
- "
- `)
-})
-
-test('Calling non function value true error message differs from verbose version', () => {
- return expectDifferentParsedErrors(
- callingNonFunctionValueTrue,
- callingNonFunctionValueTrueVerbose
- ).toBe(undefined)
-})
-
-const callingNonFunctionValue0 = stripIndent`
-0();
-`
-
-const callingNonFunctionValue0Verbose = stripIndent`
-"enable verbose";
- 0();
-`
-
-test('Error when calling non function value 0', () => {
- return expectParsedError(callingNonFunctionValue0, { native: true }).toMatchInlineSnapshot(
- `"Line 1: Calling non-function value 0."`
- )
-})
-
-test('Error when calling non function value 0 - verbose', () => {
- return expectParsedError(callingNonFunctionValue0Verbose).toMatchInlineSnapshot(`
- "Line 2, Column 2: Calling non-function value 0.
- Because 0 is not a function, you cannot run 0(). If you were planning to perform multiplication by 0, you need to use the * operator.
- "
- `)
-})
-
-test('Calling non function value 0 error message differs from verbose version', () => {
- return expectDifferentParsedErrors(
- callingNonFunctionValue0,
- callingNonFunctionValue0Verbose
- ).toBe(undefined)
-})
-
-const callingNonFunctionValueString = stripIndent`
-'string'();
-`
-
-const callingNonFunctionValueStringVerbose = stripIndent`
-"enable verbose";
- 'string'();
-`
-
-test('Error when calling non function value "string"', () => {
- return expectParsedError(callingNonFunctionValueString, { native: true }).toMatchInlineSnapshot(
- `"Line 1: Calling non-function value \\"string\\"."`
- )
-})
-
-test('Error when calling non function value "string" - verbose', () => {
- return expectParsedError(callingNonFunctionValueStringVerbose).toMatchInlineSnapshot(`
- "Line 2, Column 2: Calling non-function value \\"string\\".
- Because \\"string\\" is not a function, you cannot run \\"string\\"().
- "
- `)
-})
-
-test('Calling non function value string error message differs from verbose version', () => {
- return expectDifferentParsedErrors(
- callingNonFunctionValueString,
- callingNonFunctionValueStringVerbose
- ).toBe(undefined)
-})
-
-const callingNonFunctionValueArray = stripIndent`
-[1]();
-`
-
-const callingNonFunctionValueArrayVerbose = stripIndent`
-"enable verbose";
-[1]();
-`
-
-test('Error when calling non function value array', () => {
- return expectParsedError(callingNonFunctionValueArray, {
- chapter: Chapter.SOURCE_3,
- native: true
- }).toMatchInlineSnapshot(`"Line 1: Calling non-function value [1]."`)
-})
-
-test('Error when calling non function value array - verbose', () => {
- return expectParsedError(callingNonFunctionValueArrayVerbose, { chapter: Chapter.SOURCE_3 })
- .toMatchInlineSnapshot(`
- "Line 2, Column 0: Calling non-function value [1].
- Because [1] is not a function, you cannot run [1]().
- "
- `)
-})
-
-test('Calling non function value array error message differs from verbose version', () => {
- return expectDifferentParsedErrors(
- callingNonFunctionValueArray,
- callingNonFunctionValueArrayVerbose
- ).toBe(undefined)
-})
-
-const callingNonFunctionValueObject = stripIndent`
-({a: 1})();
-`
-
-const callingNonFunctionValueObjectVerbose = stripIndent`
-"enable verbose";
-({a: 1})();
-`
-
-test('Error when calling non function value object', () => {
- return expectParsedError(callingNonFunctionValueObject, {
- chapter: Chapter.LIBRARY_PARSER
- }).toMatchInlineSnapshot(`"Line 1: Calling non-function value {\\"a\\": 1}."`)
-})
-
-test('Error when calling non function value object - verbose', () => {
- return expectParsedError(callingNonFunctionValueObjectVerbose, {
- chapter: Chapter.LIBRARY_PARSER
- }).toMatchInlineSnapshot(`
- "Line 2, Column 0: Calling non-function value {\\"a\\": 1}.
- Because {\\"a\\": 1} is not a function, you cannot run {\\"a\\": 1}().
- "
- `)
-})
-
-test('Calling non function value object error message differs from verbose version', () => {
- return expectDifferentParsedErrors(
- callingNonFunctionValueObject,
- callingNonFunctionValueObjectVerbose
- ).toBe(undefined)
-})
-
-test('Error when calling non function value object - verbose', () => {
- return expectParsedError(
- stripIndent`
- "enable verbose";
- ({a: 1})();
- `,
- { chapter: Chapter.LIBRARY_PARSER }
- ).toMatchInlineSnapshot(`
- "Line 2, Column 0: Calling non-function value {\\"a\\": 1}.
- Because {\\"a\\": 1} is not a function, you cannot run {\\"a\\": 1}().
- "
- `)
-})
-
-test('Error when calling function with too few arguments', () => {
- return expectParsedError(
- stripIndent`
- function f(x) {
- return x;
- }
- f();
- `,
- { native: true }
- ).toMatchInlineSnapshot(`"Line 4: Expected 1 arguments, but got 0."`)
-})
-
-test('Error when calling function with too few arguments - verbose', () => {
- return expectParsedError(stripIndent`
- "enable verbose";
- function f(x) {
- return x;
- }
- f();
- `).toMatchInlineSnapshot(`
- "Line 5, Column 2: Expected 1 arguments, but got 0.
- Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
- "
- `)
-})
-
-test('Error when calling function with too many arguments', () => {
- return expectParsedError(
- stripIndent`
- function f(x) {
- return x;
- }
- f(1, 2);
- `,
- { native: true }
- ).toMatchInlineSnapshot(`"Line 4: Expected 1 arguments, but got 2."`)
-})
-
-test('Error when calling function with too many arguments - verbose', () => {
- return expectParsedError(stripIndent`
- "enable verbose";
- function f(x) {
- return x;
- }
- f(1, 2);
- `).toMatchInlineSnapshot(`
- "Line 5, Column 2: Expected 1 arguments, but got 2.
- Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
- "
- `)
-})
-
-test('Error when calling arrow function with too few arguments', () => {
- return expectParsedError(
- stripIndent`
- const f = x => x;
- f();
- `,
- { native: true }
- ).toMatchInlineSnapshot(`"Line 2: Expected 1 arguments, but got 0."`)
-})
-
-test('Error when calling arrow function with too few arguments - verbose', () => {
- return expectParsedError(stripIndent`
- "enable verbose";
- const f = x => x;
- f();
- `).toMatchInlineSnapshot(`
- "Line 3, Column 2: Expected 1 arguments, but got 0.
- Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
- "
- `)
-})
-
-test('Error when calling arrow function with too many arguments', () => {
- return expectParsedError(
- stripIndent`
- const f = x => x;
- f(1, 2);
- `,
- { native: true }
- ).toMatchInlineSnapshot(`"Line 2: Expected 1 arguments, but got 2."`)
-})
-
-test('Error when calling arrow function with too many arguments - verbose', () => {
- return expectParsedError(stripIndent`
- "enable verbose";
- const f = x => x;
- f(1, 2);
- `).toMatchInlineSnapshot(`
- "Line 3, Column 2: Expected 1 arguments, but got 2.
- Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
- "
- `)
-})
-
-test('Error when calling function from member expression with too many arguments', () => {
- return expectParsedError(
- stripIndent`
- const f = [x => x];
- f[0](1, 2);
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 2: Expected 1 arguments, but got 2."`)
-})
-
-test('Error when calling function from member expression with too many arguments - verbose', () => {
- return expectParsedError(
- stripIndent`
- "enable verbose";
- const f = [x => x];
- f[0](1, 2);
- `,
- { chapter: Chapter.SOURCE_3 }
- ).toMatchInlineSnapshot(`
- "Line 3, Column 2: Expected 1 arguments, but got 2.
- Try calling function f[0] again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
- "
- `)
-})
-
-test('Error when calling arrow function in tail call with too many arguments - verbose', () => {
- return expectParsedError(
- stripIndent`
- "enable verbose";
- const g = () => 1;
- const f = x => g(x);
- f(1);
- `
- ).toMatchInlineSnapshot(`
- "Line 3, Column 15: Expected 0 arguments, but got 1.
- Try calling function g again, but with 0 arguments instead. Remember that arguments are separated by a ',' (comma).
- "
- `)
-})
-
-test('Error when calling arrow function in tail call with too many arguments', () => {
- return expectParsedError(
- stripIndent`
- const g = () => 1;
- const f = x => g(x);
- f(1);
- `,
- { native: true }
- ).toMatchInlineSnapshot(`"Line 2: Expected 0 arguments, but got 1."`)
-})
-
-test('Error when calling builtin function in with too many arguments', () => {
- return expectParsedError(
- stripIndent`
- is_number(1, 2, 3);
- `,
- { native: true }
- ).toMatchInlineSnapshot(`"Line 1: Expected 1 arguments, but got 3."`)
-})
-
-test('Error when calling builtin function in with too few arguments', () => {
- return expectParsedError(
- stripIndent`
- parse_int("");
- `,
- { native: true }
- ).toMatchInlineSnapshot(`"Line 1: Expected 2 arguments, but got 1."`)
-})
-
-test('No error when calling list function in with variable arguments', () => {
- return expectResult(
- stripIndent`
- list();
- list(1);
- list(1, 2, 3);
- list(1, 2, 3, 4, 5, 6, 6);
- `,
- { native: true, chapter: Chapter.SOURCE_2 }
- ).toMatchInlineSnapshot(`
- Array [
- 1,
- Array [
- 2,
- Array [
- 3,
- Array [
- 4,
- Array [
- 5,
- Array [
- 6,
- Array [
- 6,
- null,
- ],
- ],
- ],
- ],
- ],
- ],
- ]
- `)
-})
-
-test('No error when calling display function in with variable arguments', () => {
- return expectResult(
- stripIndent`
- display(1);
- display(1, "test");
- `,
- { native: true, chapter: Chapter.SOURCE_2 }
- ).toMatchInlineSnapshot(`1`)
-})
-
-test('No error when calling stringify function in with variable arguments', () => {
- return expectResult(
- stripIndent`
- stringify(1, 2);
- stringify(1, 2, 3);
- `,
- { native: true, chapter: Chapter.SOURCE_2 }
- ).toMatchInlineSnapshot(`"1"`)
-})
-
-test('No error when calling math_max function in with variable arguments', () => {
- return expectResult(
- stripIndent`
- math_max();
- math_max(1, 2);
- math_max(1, 2, 3);
- `,
- { native: true, chapter: Chapter.SOURCE_2 }
- ).toMatchInlineSnapshot(`3`)
-})
-
-test('No error when calling math_min function in with variable arguments', () => {
- return expectResult(
- stripIndent`
- math_min();
- math_min(1, 2);
- math_min(1, 2, 3);
- `,
- { native: true, chapter: Chapter.SOURCE_2 }
- ).toMatchInlineSnapshot(`1`)
-})
-
-test('Error with too many arguments passed to math_sin', () => {
- return expectParsedError(
- stripIndent`
- math_sin(7,8);
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Expected 1 arguments, but got 2."`)
-})
-
-test('Error with too few arguments passed to rest parameters', () => {
- return expectParsedError(
- stripIndent`
- function rest(a, b, ...c) {}
- rest(1);
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 2: Expected 2 or more arguments, but got 1."`)
-})
-
-test('Error when redeclaring constant', () => {
- return expectParsedError(
- stripIndent`
- const f = x => x;
- const f = x => x;
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 2: SyntaxError: Identifier 'f' has already been declared (2:6)"`)
-})
-
-test('Error when redeclaring constant as variable', () => {
- return expectParsedError(
- stripIndent`
- const f = x => x;
- let f = x => x;
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 2: SyntaxError: Identifier 'f' has already been declared (2:4)"`)
-})
-
-test('Error when redeclaring variable as constant', () => {
- return expectParsedError(
- stripIndent`
- let f = x => x;
- const f = x => x;
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 2: SyntaxError: Identifier 'f' has already been declared (2:6)"`)
-})
-
-test('Error when redeclaring variable', () => {
- return expectParsedError(
- stripIndent`
- let f = x => x;
- let f = x => x;
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 2: SyntaxError: Identifier 'f' has already been declared (2:4)"`)
-})
-
-test('Error when redeclaring function after let', () => {
- return expectParsedError(
- stripIndent`
- let f = x => x;
- function f() {}
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 2: SyntaxError: Identifier 'f' has already been declared (2:9)"`)
-})
-
-test('Error when redeclaring function after let --verbose', () => {
- return expectParsedError(
- stripIndent`
- "enable verbose";
- let f = x => x;
- function f() {}
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`
- "Line 3, Column 9: SyntaxError: Identifier 'f' has already been declared (3:9)
- There is a syntax error in your program
- "
- `)
-})
-
-test('Error when redeclaring function after function', () => {
- return expectParsedError(
- stripIndent`
- function f() {}
- function f() {}
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 2: SyntaxError: Identifier 'f' has already been declared (2:9)"`)
-})
-
-test('Error when redeclaring function after function --verbose', () => {
- return expectParsedError(
- stripIndent`
- "enable verbose";
- function f() {}
- function f() {}
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`
- "Line 3, Column 9: SyntaxError: Identifier 'f' has already been declared (3:9)
- There is a syntax error in your program
- "
- `)
-})
-
-test('Error when redeclaring function after const', () => {
- return expectParsedError(
- stripIndent`
- const f = x => x;
- function f() {}
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 2: SyntaxError: Identifier 'f' has already been declared (2:9)"`)
-})
-
-test('Error when redeclaring function after const --verbose', () => {
- return expectParsedError(
- stripIndent`
- "enable verbose";
- const f = x => x;
- function f() {}
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`
- "Line 3, Column 9: SyntaxError: Identifier 'f' has already been declared (3:9)
- There is a syntax error in your program
- "
- `)
-})
-
-test('Error when redeclaring const after function', () => {
- return expectParsedError(
- stripIndent`
- function f() {}
- const f = x => x;
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 2: SyntaxError: Identifier 'f' has already been declared (2:6)"`)
-})
-
-test('Error when redeclaring const after function --verbose', () => {
- return expectParsedError(
- stripIndent`
- "enable verbose";
- function f() {}
- const f = x => x;
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`
- "Line 3, Column 6: SyntaxError: Identifier 'f' has already been declared (3:6)
- There is a syntax error in your program
- "
- `)
-})
-
-test('Error when redeclaring let after function', () => {
- return expectParsedError(
- stripIndent`
- function f() {}
- let f = x => x;
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`"Line 2: SyntaxError: Identifier 'f' has already been declared (2:4)"`)
-})
-
-test('Error when redeclaring let after function --verbose', () => {
- return expectParsedError(
- stripIndent`
- "enable verbose";
- function f() {}
- let f = x => x;
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(`
- "Line 3, Column 4: SyntaxError: Identifier 'f' has already been declared (3:4)
- There is a syntax error in your program
- "
- `)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when accessing property of null', () => {
- return expectParsedError(
- stripIndent`
- null["prop"];
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Cannot read property prop of null"`)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when accessing property of undefined', () => {
- return expectParsedError(
- stripIndent`
- undefined["prop"];
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Cannot read property prop of undefined"`)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when accessing inherited property of builtin', () => {
- return expectParsedError(
- stripIndent`
- pair["constructor"];
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`
- "Line 1: Cannot read inherited property constructor of function pair(left, right) {
- [implementation hidden]
- }"
- `)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when accessing inherited property of function', () => {
- return expectParsedError(
- stripIndent`
- function f() {}
- f["constructor"];
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 2: Cannot read inherited property constructor of function f() {}"`)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when accessing inherited property of arrow function', () => {
- return expectParsedError(
- stripIndent`
- (() => 1)["constructor"];
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Cannot read inherited property constructor of () => 1"`)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when accessing inherited property of array', () => {
- return expectParsedError(
- stripIndent`
- [].push;
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Cannot read inherited property push of []"`)
-})
-
-test('Error when accessing inherited property of object', () => {
- return expectParsedError(
- stripIndent`
- ({}).valueOf;
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Cannot read inherited property valueOf of {}."`)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when accessing inherited property of string', () => {
- return expectParsedError(
- stripIndent`
- 'hi'.includes;
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Cannot read inherited property includes of \\"hi\\""`)
-})
-
-// NOTE: Obsoleted due to strict types on member access
-test.skip('Error when accessing inherited property of number', () => {
- return expectParsedError(
- stripIndent`
- (1).toPrecision;
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Cannot read inherited property toPrecision of 1"`)
-})
-
-test('Access local property', () => {
- return expectResult(
- stripIndent`
- ({a: 0})["a"];
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`0`)
-})
-
-test('Type error when accessing property of null', () => {
- return expectParsedError(
- stripIndent`
- null.prop;
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Expected object or array, got null."`)
-})
-
-test('Type error when accessing property of string', () => {
- return expectParsedError(
- stripIndent`
- 'hi'.length;
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Expected object or array, got string."`)
-})
-
-test('Type error when accessing property of function', () => {
- return expectParsedError(
- stripIndent`
- function f() {
- return 1;
- }
- f.prototype;
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 4: Expected object or array, got function."`)
-})
-
-test('Type error when assigning property of string', () => {
- return expectParsedError(
- stripIndent`
- 'hi'.prop = 5;
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Expected object or array, got string."`)
-})
-
-test('Type error when assigning property of function', () => {
- return expectParsedError(
- stripIndent`
- function f() {
- return 1;
- }
- f.prop = 5;
- `,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
- ).toMatchInlineSnapshot(`"Line 4: Expected object or array, got function."`)
-})
-
-test('Type error with non boolean in if statement, error line at if statement, not at 1', () => {
- return expectParsedError(
- stripIndent`
- if (
- 1
- ) {
- 2;
- } else {}
- `,
- { chapter: Chapter.SOURCE_1, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Expected boolean as condition, got number."`)
-})
-
-test('Type error with <number> * <nonnumber>, error line at <number>, not <nonnumber>', () => {
- return expectParsedError(
- stripIndent`
- 12
- *
- 'string';
- `,
- { chapter: Chapter.SOURCE_1, native: true }
- ).toMatchInlineSnapshot(`"Line 1: Expected number on right hand side of operation, got string."`)
-})
-
-test('Cascading js errors work properly 1', () => {
- return expectParsedError(
- stripIndent`
- function make_alternating_stream(stream) {
- return pair(head(stream), () => make_alternating_stream(
- negate_whole_stream(
- stream_tail(stream))));
- }
-
- function negate_whole_stream(stream) {
- return pair(-head(stream), () => negate_whole_stream(stream_tail(stream)));
- }
-
- const ones = pair(1, () => ones);
- eval_stream(make_alternating_stream(enum_stream(1, 9)), 10);
- `,
- { chapter: Chapter.SOURCE_3, native: true }
- ).toMatchInlineSnapshot(
- `"Line 8: Error: head(xs) expects a pair as argument xs, but encountered null"`
- )
-})
-
-test('Cascading js errors work properly', () => {
- return expectParsedError(
- stripIndent`
- function h(p) {
- return head(p);
- }
-
- h(null);
- `,
- { chapter: Chapter.SOURCE_2, native: true }
- ).toMatchInlineSnapshot(
- `"Line 2: Error: head(xs) expects a pair as argument xs, but encountered null"`
- )
-})
diff --git a/src/interpreter/closure.ts b/src/interpreter/closure.ts
deleted file mode 100644
index a781d5f57..000000000
--- a/src/interpreter/closure.ts
+++ /dev/null
@@ -1,138 +0,0 @@
-/* tslint:disable:max-classes-per-file */
-import { generate } from 'astring'
-import * as es from 'estree'
-
-import {
- hasReturnStatement,
- isBlockStatement,
- isStatementSequence,
- uniqueId
-} from '../cse-machine/utils'
-import { Context, Environment, StatementSequence, Value } from '../types'
-import {
- blockArrowFunction,
- blockStatement,
- callExpression,
- identifier,
- returnStatement
-} from '../utils/ast/astCreator'
-import { apply } from './interpreter'
-
-const closureToJS = (value: Closure, context: Context, klass: string) => {
- function DummyClass(this: Closure) {
- const args: Value[] = Array.prototype.slice.call(arguments)
- const gen = apply(context, value, args, callExpression(identifier(klass), args), this)
- let it = gen.next()
- while (!it.done) {
- it = gen.next()
- }
- return it.value
- }
- Object.defineProperty(DummyClass, 'name', {
- value: klass
- })
- Object.setPrototypeOf(DummyClass, () => undefined)
- Object.defineProperty(DummyClass, 'Inherits', {
- value: (Parent: Value) => {
- DummyClass.prototype = Object.create(Parent.prototype)
- DummyClass.prototype.constructor = DummyClass
- }
- })
- DummyClass.toString = () => generate(value.originalNode)
- DummyClass.call = (thisArg: Value, ...args: Value[]): any => {
- return DummyClass.apply(thisArg, args)
- }
- return DummyClass
-}
-
-class Callable extends Function {
- constructor(f: any) {
- super()
- return Object.setPrototypeOf(f, new.target.prototype)
- }
-}
-
-/**
- * Models function value in the interpreter environment.
- */
-export default class Closure extends Callable {
- public static makeFromArrowFunction(
- node: es.ArrowFunctionExpression,
- environment: Environment,
- context: Context,
- dummyReturn?: boolean,
- predefined?: boolean
- ) {
- const functionBody: es.BlockStatement | StatementSequence =
- !isBlockStatement(node.body) && !isStatementSequence(node.body)
- ? blockStatement([returnStatement(node.body, node.body.loc)], node.body.loc)
- : dummyReturn && !hasReturnStatement(node.body)
- ? blockStatement(
- [
- ...node.body.body,
- returnStatement(identifier('undefined', node.body.loc), node.body.loc)
- ],
- node.body.loc
- )
- : node.body
-
- const closure = new Closure(
- blockArrowFunction(node.params as es.Identifier[], functionBody, node.loc),
- environment,
- context,
- predefined
- )
-
- // Set the closure's node to point back at the original one
- closure.originalNode = node
-
- return closure
- }
-
- /** Unique ID defined for closure */
- public readonly id: string
-
- /** String representation of the closure */
- public functionName: string
-
- /** Fake closure function */
- // tslint:disable-next-line:ban-types
- public fun: Function
-
- /** Keeps track of whether the closure is a pre-defined function */
- public preDefined?: boolean
-
- /** The original node that created this Closure */
- public originalNode: es.Function | es.ArrowFunctionExpression
-
- constructor(
- public node: es.Function | es.ArrowFunctionExpression,
- public environment: Environment,
- context: Context,
- isPredefined?: boolean
- ) {
- super(function (this: any, ...args: any[]) {
- return funJS.apply(this, args)
- })
- this.originalNode = node
- this.id = uniqueId(context)
- if (this.node.type === 'FunctionDeclaration' && this.node.id !== null) {
- this.functionName = this.node.id.name
- } else {
- this.functionName =
- (this.node.params.length === 1 ? '' : '(') +
- this.node.params.map((o: es.Identifier) => o.name).join(', ') +
- (this.node.params.length === 1 ? '' : ')') +
- ' => ...'
- }
- // TODO: Investigate how relevant this really is.
- // .fun seems to only be used in interpreter's NewExpression handler, which uses .fun.prototype.
- const funJS = closureToJS(this, context, this.functionName)
- this.fun = funJS
- this.preDefined = isPredefined == undefined ? undefined : isPredefined
- }
-
- public toString(): string {
- return generate(this.originalNode)
- }
-}
diff --git a/src/interpreter/interpreter.ts b/src/interpreter/interpreter.ts
deleted file mode 100644
index ae23f7655..000000000
--- a/src/interpreter/interpreter.ts
+++ /dev/null
@@ -1,858 +0,0 @@
-/* tslint:disable:max-classes-per-file */
-import type es from 'estree'
-import { isEmpty } from 'lodash'
-
-import { UNKNOWN_LOCATION } from '../constants'
-import Heap from '../cse-machine/heap'
-import { uniqueId } from '../cse-machine/utils'
-import * as errors from '../errors/errors'
-import { RuntimeSourceError } from '../errors/runtimeSourceError'
-import { checkEditorBreakpoints } from '../stdlib/inspector'
-import type { Context, ContiguousArrayElements, Environment, Node, Value } from '../types'
-import * as create from '../utils/ast/astCreator'
-import { conditionalExpression, literal, primitive } from '../utils/ast/astCreator'
-import { getModuleDeclarationSource } from '../utils/ast/helpers'
-import { evaluateBinaryExpression, evaluateUnaryExpression } from '../utils/operators'
-import * as rttc from '../utils/rttc'
-import Closure from './closure'
-
-class BreakValue {}
-
-class ContinueValue {}
-
-class ReturnValue {
- constructor(public value: Value) {}
-}
-
-class TailCallReturnValue {
- constructor(public callee: Closure, public args: Value[], public node: es.CallExpression) {}
-}
-
-class Thunk {
- public value: Value
- public isMemoized: boolean
- constructor(public exp: Node, public env: Environment) {
- this.isMemoized = false
- this.value = null
- }
-}
-
-function* forceIt(val: any, context: Context): Value {
- if (val instanceof Thunk) {
- if (val.isMemoized) return val.value
-
- pushEnvironment(context, val.env)
- const evalRes = yield* actualValue(val.exp, context)
- popEnvironment(context)
- val.value = evalRes
- val.isMemoized = true
- return evalRes
- } else return val
-}
-
-export function* actualValue(exp: Node, context: Context): Value {
- const evalResult = yield* evaluate(exp, context)
- const forced = yield* forceIt(evalResult, context)
- return forced
-}
-
-const createEnvironment = (
- context: Context,
- closure: Closure,
- args: Value[],
- callExpression?: es.CallExpression
-): Environment => {
- const environment: Environment = {
- name: closure.functionName, // TODO: Change this
- tail: closure.environment,
- head: {},
- heap: new Heap(),
- id: uniqueId(context)
- }
- if (callExpression) {
- environment.callExpression = {
- ...callExpression,
- arguments: args.map(primitive)
- }
- }
- closure.node.params.forEach((param, index) => {
- if (param.type === 'RestElement') {
- environment.head[(param.argument as es.Identifier).name] = args.slice(index)
- } else {
- environment.head[(param as es.Identifier).name] = args[index]
- }
- })
- return environment
-}
-
-export const createBlockEnvironment = (
- context: Context,
- name = 'blockEnvironment'
-): Environment => {
- return {
- name,
- tail: currentEnvironment(context),
- head: {},
- heap: new Heap(),
- id: uniqueId(context)
- }
-}
-
-const handleRuntimeError = (context: Context, error: RuntimeSourceError): never => {
- context.errors.push(error)
- context.runtime.environments = context.runtime.environments.slice(
- -context.numberOfOuterEnvironments
- )
- throw error
-}
-
-const DECLARED_BUT_NOT_YET_ASSIGNED = Symbol('Used to implement block scope')
-
-function declareIdentifier(context: Context, name: string, node: Node) {
- const environment = currentEnvironment(context)
- if (environment.head.hasOwnProperty(name)) {
- const descriptors = Object.getOwnPropertyDescriptors(environment.head)
-
- return handleRuntimeError(
- context,
- new errors.VariableRedeclaration(node, name, descriptors[name].writable)
- )
- }
- environment.head[name] = DECLARED_BUT_NOT_YET_ASSIGNED
- return environment
-}
-
-function declareVariables(context: Context, node: es.VariableDeclaration) {
- for (const declaration of node.declarations) {
- declareIdentifier(context, (declaration.id as es.Identifier).name, node)
- }
-}
-
-function declareFunctionsAndVariables(context: Context, node: es.BlockStatement) {
- for (const statement of node.body) {
- switch (statement.type) {
- case 'VariableDeclaration':
- declareVariables(context, statement)
- break
- case 'FunctionDeclaration':
- if (statement.id === null) {
- throw new Error(
- 'Encountered a FunctionDeclaration node without an identifier. This should have been caught when parsing.'
- )
- }
- declareIdentifier(context, statement.id.name, statement)
- break
- }
- }
-}
-
-function defineVariable(context: Context, name: string, value: Value, constant = false) {
- const environment = currentEnvironment(context)
-
- if (environment.head[name] !== DECLARED_BUT_NOT_YET_ASSIGNED) {
- return handleRuntimeError(
- context,
- new errors.VariableRedeclaration(context.runtime.nodes[0]!, name, !constant)
- )
- }
-
- Object.defineProperty(environment.head, name, {
- value,
- writable: !constant,
- enumerable: true
- })
-
- return environment
-}
-
-function* visit(context: Context, node: Node) {
- checkEditorBreakpoints(context, node)
- context.runtime.nodes.unshift(node)
- yield context
-}
-
-function* leave(context: Context) {
- context.runtime.break = false
- context.runtime.nodes.shift()
- yield context
-}
-
-const currentEnvironment = (context: Context) => context.runtime.environments[0]
-const replaceEnvironment = (context: Context, environment: Environment) => {
- context.runtime.environments[0] = environment
- context.runtime.environmentTree.insert(environment)
-}
-const popEnvironment = (context: Context) => context.runtime.environments.shift()
-export const pushEnvironment = (context: Context, environment: Environment) => {
- context.runtime.environments.unshift(environment)
- context.runtime.environmentTree.insert(environment)
-}
-
-const getVariable = (context: Context, name: string) => {
- let environment: Environment | null = currentEnvironment(context)
- while (environment) {
- if (environment.head.hasOwnProperty(name)) {
- if (environment.head[name] === DECLARED_BUT_NOT_YET_ASSIGNED) {
- return handleRuntimeError(
- context,
- new errors.UnassignedVariable(name, context.runtime.nodes[0])
- )
- } else {
- return environment.head[name]
- }
- } else {
- environment = environment.tail
- }
- }
- return handleRuntimeError(context, new errors.UndefinedVariable(name, context.runtime.nodes[0]))
-}
-
-const setVariable = (context: Context, name: string, value: any) => {
- let environment: Environment | null = currentEnvironment(context)
- while (environment) {
- if (environment.head.hasOwnProperty(name)) {
- if (environment.head[name] === DECLARED_BUT_NOT_YET_ASSIGNED) {
- break
- }
- const descriptors = Object.getOwnPropertyDescriptors(environment.head)
- if (descriptors[name].writable) {
- environment.head[name] = value
- return undefined
- }
- return handleRuntimeError(
- context,
- new errors.ConstAssignment(context.runtime.nodes[0]!, name)
- )
- } else {
- environment = environment.tail
- }
- }
- return handleRuntimeError(context, new errors.UndefinedVariable(name, context.runtime.nodes[0]))
-}
-
-const checkNumberOfArguments = (
- context: Context,
- callee: Closure | Value,
- args: Value[],
- exp: es.CallExpression
-) => {
- if (callee instanceof Closure) {
- const params = callee.node.params
- const hasVarArgs = params[params.length - 1]?.type === 'RestElement'
- if (hasVarArgs ? params.length - 1 > args.length : params.length !== args.length) {
- return handleRuntimeError(
- context,
- new errors.InvalidNumberOfArguments(
- exp,
- hasVarArgs ? params.length - 1 : params.length,
- args.length,
- hasVarArgs
- )
- )
- }
- } else {
- const hasVarArgs = callee.minArgsNeeded != undefined
- if (hasVarArgs ? callee.minArgsNeeded > args.length : callee.length !== args.length) {
- return handleRuntimeError(
- context,
- new errors.InvalidNumberOfArguments(
- exp,
- hasVarArgs ? callee.minArgsNeeded : callee.length,
- args.length,
- hasVarArgs
- )
- )
- }
- }
- return undefined
-}
-
-function* getArgs(context: Context, call: es.CallExpression) {
- const args = []
- for (const arg of call.arguments) {
- if (arg.type === 'SpreadElement') {
- args.push(...(yield* actualValue(arg.argument, context)))
- } else {
- args.push(yield* actualValue(arg, context))
- }
- }
- return args
-}
-
-function transformLogicalExpression(node: es.LogicalExpression): es.ConditionalExpression {
- if (node.operator === '&&') {
- return conditionalExpression(node.left, node.right, literal(false), node.loc)
- } else {
- return conditionalExpression(node.left, literal(true), node.right, node.loc)
- }
-}
-
-function* reduceIf(
- node: es.IfStatement | es.ConditionalExpression,
- context: Context
-): IterableIterator<null | Node> {
- const test = yield* actualValue(node.test, context)
-
- const error = rttc.checkIfStatement(node, test, context.chapter)
- if (error) {
- return handleRuntimeError(context, error)
- }
-
- return test ? node.consequent : node.alternate
-}
-
-export type Evaluator<T extends Node> = (node: T, context: Context) => IterableIterator<Value>
-
-function* evaluateBlockStatement(context: Context, node: es.BlockStatement) {
- declareFunctionsAndVariables(context, node)
- let result
- for (const statement of node.body) {
- result = yield* evaluate(statement, context)
- if (
- result instanceof ReturnValue ||
- result instanceof TailCallReturnValue ||
- result instanceof BreakValue ||
- result instanceof ContinueValue
- ) {
- break
- }
- }
- return result
-}
-
-/**
- * WARNING: Do not use object literal shorthands, e.g.
- * {
- * *Literal(node: es.Literal, ...) {...},
- * *ThisExpression(node: es.ThisExpression, ..._ {...},
- * ...
- * }
- * They do not minify well, raising uncaught syntax errors in production.
- * See: https://github.com/webpack/webpack/issues/7566
- */
-// tslint:disable:object-literal-shorthand
-// prettier-ignore
-export const evaluators: { [nodeType: string]: Evaluator<Node> } = {
- /** Simple Values */
- Literal: function*(node: es.Literal, _context: Context) {
- return node.value
- },
-
- TemplateLiteral: function*(node: es.TemplateLiteral) {
- // Expressions like `${1}` are not allowed, so no processing needed
- return node.quasis[0].value.cooked
- },
-
- ThisExpression: function*(node: es.ThisExpression, context: Context) {
- return currentEnvironment(context).thisContext
- },
-
- ArrayExpression: function*(node: es.ArrayExpression, context: Context) {
- const res = []
- for (const n of node.elements as ContiguousArrayElements) {
- res.push(yield* evaluate(n, context))
- }
- return res
- },
-
- DebuggerStatement: function*(node: es.DebuggerStatement, context: Context) {
- context.runtime.break = true
- yield
- },
-
- FunctionExpression: function*(node: es.FunctionExpression, context: Context) {
- return new Closure(node, currentEnvironment(context), context)
- },
-
- ArrowFunctionExpression: function*(node: es.ArrowFunctionExpression, context: Context) {
- return Closure.makeFromArrowFunction(node, currentEnvironment(context), context)
- },
-
- Identifier: function*(node: es.Identifier, context: Context) {
- return getVariable(context, node.name)
- },
-
- CallExpression: function*(node: es.CallExpression, context: Context) {
- const callee = yield* actualValue(node.callee, context)
- const args = yield* getArgs(context, node)
- let thisContext
- if (node.callee.type === 'MemberExpression') {
- thisContext = yield* actualValue(node.callee.object, context)
- }
- const result = yield* apply(context, callee, args, node, thisContext)
- return result
- },
-
- NewExpression: function*(node: es.NewExpression, context: Context) {
- const callee = yield* evaluate(node.callee, context)
- const args = []
- for (const arg of node.arguments) {
- args.push(yield* evaluate(arg, context))
- }
- const obj: Value = {}
- if (callee instanceof Closure) {
- obj.__proto__ = callee.fun.prototype
- callee.fun.apply(obj, args)
- } else {
- obj.__proto__ = callee.prototype
- callee.apply(obj, args)
- }
- return obj
- },
-
- UnaryExpression: function*(node: es.UnaryExpression, context: Context) {
- const value = yield* actualValue(node.argument, context)
-
- const error = rttc.checkUnaryExpression(node, node.operator, value, context.chapter)
- if (error) {
- return handleRuntimeError(context, error)
- }
- return evaluateUnaryExpression(node.operator, value)
- },
-
- BinaryExpression: function*(node: es.BinaryExpression, context: Context) {
- const left = yield* actualValue(node.left, context)
- const right = yield* actualValue(node.right, context)
- const error = rttc.checkBinaryExpression(node, node.operator, context.chapter, left, right)
- if (error) {
- return handleRuntimeError(context, error)
- }
- return evaluateBinaryExpression(node.operator, left, right)
- },
-
- ConditionalExpression: function*(node: es.ConditionalExpression, context: Context) {
- return yield* this.IfStatement(node, context)
- },
-
- LogicalExpression: function*(node: es.LogicalExpression, context: Context) {
- return yield* this.ConditionalExpression(transformLogicalExpression(node), context)
- },
-
- VariableDeclaration: function*(node: es.VariableDeclaration, context: Context) {
- const declaration = node.declarations[0]
- const constant = node.kind === 'const'
- const id = declaration.id as es.Identifier
- const value = yield* evaluate(declaration.init!, context)
- defineVariable(context, id.name, value, constant)
- return undefined
- },
-
- ContinueStatement: function*(_node: es.ContinueStatement, _context: Context) {
- return new ContinueValue()
- },
-
- BreakStatement: function*(_node: es.BreakStatement, _context: Context) {
- return new BreakValue()
- },
-
- ForStatement: function*(node: es.ForStatement, context: Context) {
- // Create a new block scope for the loop variables
- const loopEnvironment = createBlockEnvironment(context, 'forLoopEnvironment')
- pushEnvironment(context, loopEnvironment)
-
- const initNode = node.init!
- const testNode = node.test!
- const updateNode = node.update!
- if (initNode.type === 'VariableDeclaration') {
- declareVariables(context, initNode)
- }
- yield* actualValue(initNode, context)
-
- let value
- while (yield* actualValue(testNode, context)) {
- // create block context and shallow copy loop environment head
- // see https://www.ecma-international.org/ecma-262/6.0/#sec-for-statement-runtime-semantics-labelledevaluation
- // and https://hacks.mozilla.org/2015/07/es6-in-depth-let-and-const/
- // We copy this as a const to avoid ES6 funkiness when mutating loop vars
- // https://github.com/source-academy/js-slang/issues/65#issuecomment-425618227
- const environment = createBlockEnvironment(context, 'forBlockEnvironment')
- pushEnvironment(context, environment)
- for (const name in loopEnvironment.head) {
- if (loopEnvironment.head.hasOwnProperty(name)) {
- declareIdentifier(context, name, node)
- defineVariable(context, name, loopEnvironment.head[name], true)
- }
- }
-
- value = yield* actualValue(node.body, context)
-
- // Remove block context
- popEnvironment(context)
- if (value instanceof ContinueValue) {
- value = undefined
- }
- if (value instanceof BreakValue) {
- value = undefined
- break
- }
- if (value instanceof ReturnValue || value instanceof TailCallReturnValue) {
- break
- }
-
- yield* actualValue(updateNode, context)
- }
-
- popEnvironment(context)
-
- return value
- },
-
- MemberExpression: function*(node: es.MemberExpression, context: Context) {
- let obj = yield* actualValue(node.object, context)
- if (obj instanceof Closure) {
- obj = obj.fun
- }
- let prop
- if (node.computed) {
- prop = yield* actualValue(node.property, context)
- } else {
- prop = (node.property as es.Identifier).name
- }
-
- const error = rttc.checkMemberAccess(node, obj, prop)
- if (error) {
- return handleRuntimeError(context, error)
- }
-
- if (
- obj !== null &&
- obj !== undefined &&
- typeof obj[prop] !== 'undefined' &&
- !obj.hasOwnProperty(prop)
- ) {
- return handleRuntimeError(context, new errors.GetInheritedPropertyError(node, obj, prop))
- }
- try {
- return obj[prop]
- } catch {
- return handleRuntimeError(context, new errors.GetPropertyError(node, obj, prop))
- }
- },
-
- AssignmentExpression: function*(node: es.AssignmentExpression, context: Context) {
- if (node.left.type === 'MemberExpression') {
- const left = node.left
- const obj = yield* actualValue(left.object, context)
- let prop
- if (left.computed) {
- prop = yield* actualValue(left.property, context)
- } else {
- prop = (left.property as es.Identifier).name
- }
-
- const error = rttc.checkMemberAccess(node, obj, prop)
- if (error) {
- return handleRuntimeError(context, error)
- }
-
- const val = yield* evaluate(node.right, context)
- try {
- obj[prop] = val
- } catch {
- return handleRuntimeError(context, new errors.SetPropertyError(node, obj, prop))
- }
- return val
- }
- const id = node.left as es.Identifier
- // Make sure it exist
- const value = yield* evaluate(node.right, context)
- setVariable(context, id.name, value)
- return value
- },
-
- FunctionDeclaration: function*(node: es.FunctionDeclaration, context: Context) {
- const id = node.id
- if (id === null) {
- throw new Error("Encountered a FunctionDeclaration node without an identifier. This should have been caught when parsing.")
- }
- // tslint:disable-next-line:no-any
- const closure = new Closure(node, currentEnvironment(context), context)
- defineVariable(context, id.name, closure, true)
- return undefined
- },
-
- IfStatement: function*(node: es.IfStatement | es.ConditionalExpression, context: Context) {
- const result = yield* reduceIf(node, context)
- if (result === null) {
- return undefined;
- }
- return yield* evaluate(result, context)
- },
-
- ExpressionStatement: function*(node: es.ExpressionStatement, context: Context) {
- return yield* evaluate(node.expression, context)
- },
-
- ReturnStatement: function*(node: es.ReturnStatement, context: Context) {
- let returnExpression = node.argument!
-
- // If we have a conditional expression, reduce it until we get something else
- while (
- returnExpression.type === 'LogicalExpression' ||
- returnExpression.type === 'ConditionalExpression'
- ) {
- if (returnExpression.type === 'LogicalExpression') {
- returnExpression = transformLogicalExpression(returnExpression)
- }
- returnExpression = yield* reduceIf(returnExpression, context)
- }
-
- // If we are now left with a CallExpression, then we use TCO
- if (returnExpression.type === 'CallExpression') {
- const callee = yield* actualValue(returnExpression.callee, context)
- const args = yield* getArgs(context, returnExpression)
- return new TailCallReturnValue(callee, args, returnExpression)
- } else {
- return new ReturnValue(yield* evaluate(returnExpression, context))
- }
- },
-
- WhileStatement: function*(node: es.WhileStatement, context: Context) {
- let value: any // tslint:disable-line
- while (
- // tslint:disable-next-line
- (yield* actualValue(node.test, context)) &&
- !(value instanceof ReturnValue) &&
- !(value instanceof BreakValue) &&
- !(value instanceof TailCallReturnValue)
- ) {
- value = yield* actualValue(node.body, context)
- }
- if (value instanceof BreakValue) {
- return undefined
- }
- return value
- },
-
- ObjectExpression: function*(node: es.ObjectExpression, context: Context) {
- const obj = {}
- for (const propUntyped of node.properties) {
- // node.properties: es.Property | es.SpreadExpression, but
- // our Acorn is set to ES6 which cannot have a es.SpreadExpression
- // at this point. Force the type.
- const prop = propUntyped as es.Property
- let key
- if (prop.key.type === 'Identifier') {
- key = prop.key.name
- } else {
- key = yield* evaluate(prop.key, context)
- }
- obj[key] = yield* evaluate(prop.value, context)
- }
- return obj
- },
-
- BlockStatement: function*(node: es.BlockStatement, context: Context) {
- // Create a new environment (block scoping)
- const environment = createBlockEnvironment(context, 'blockEnvironment')
- pushEnvironment(context, environment)
- const result: Value = yield* evaluateBlockStatement(context, node)
- popEnvironment(context)
- return result
- },
-
- ImportDeclaration: function*(node: es.ImportDeclaration, context: Context) {
- throw new Error('ImportDeclarations should already have been removed')
- },
-
- ExportNamedDeclaration: function*(_node: es.ExportNamedDeclaration, _context: Context) {
- // Exports are handled as a separate pre-processing step in 'transformImportedFile'.
- // Subsequently, they are removed from the AST by 'removeExports' before the AST is evaluated.
- // As such, there should be no ExportNamedDeclaration nodes in the AST.
- throw new Error('Encountered an ExportNamedDeclaration node in the AST while evaluating. This suggests that an invariant has been broken.')
- },
-
- ExportDefaultDeclaration: function*(_node: es.ExportDefaultDeclaration, _context: Context) {
- // Exports are handled as a separate pre-processing step in 'transformImportedFile'.
- // Subsequently, they are removed from the AST by 'removeExports' before the AST is evaluated.
- // As such, there should be no ExportDefaultDeclaration nodes in the AST.
- throw new Error('Encountered an ExportDefaultDeclaration node in the AST while evaluating. This suggests that an invariant has been broken.')
- },
-
- ExportAllDeclaration: function*(_node: es.ExportAllDeclaration, _context: Context) {
- // Exports are handled as a separate pre-processing step in 'transformImportedFile'.
- // Subsequently, they are removed from the AST by 'removeExports' before the AST is evaluated.
- // As such, there should be no ExportAllDeclaration nodes in the AST.
- throw new Error('Encountered an ExportAllDeclaration node in the AST while evaluating. This suggests that an invariant has been broken.')
- },
-
- Program: function*(node: es.BlockStatement, context: Context) {
- throw new Error('A program should not contain another program within itself')
- }
-}
-// tslint:enable:object-literal-shorthand
-
-// TODO: move to util
-/**
- * Checks if `env` is empty (that is, head of env is an empty object)
- */
-function isEmptyEnvironment(env: Environment) {
- return isEmpty(env.head)
-}
-
-/**
- * Extracts the non-empty tail environment from the given environment and
- * returns current environment if tail environment is a null.
- */
-function getNonEmptyEnv(environment: Environment): Environment {
- if (isEmptyEnvironment(environment)) {
- const tailEnvironment = environment.tail
- if (tailEnvironment === null) {
- return environment
- }
- return getNonEmptyEnv(tailEnvironment)
- } else {
- return environment
- }
-}
-
-export function* evaluateProgram(program: es.Program, context: Context) {
- yield* visit(context, program)
-
- context.numberOfOuterEnvironments += 1
- const environment = createBlockEnvironment(context, 'programEnvironment')
- pushEnvironment(context, environment)
-
- const otherNodes: es.Statement[] = []
-
- try {
- for (const node of program.body) {
- if (node.type !== 'ImportDeclaration') {
- otherNodes.push(node as es.Statement)
- continue
- }
-
- yield* visit(context, node)
-
- const moduleName = getModuleDeclarationSource(node)
- const functions = context.nativeStorage.loadedModules[moduleName]
-
- for (const spec of node.specifiers) {
- declareIdentifier(context, spec.local.name, node)
- let obj: any
-
- switch (spec.type) {
- case 'ImportSpecifier': {
- obj = functions[spec.imported.name]
- break
- }
- case 'ImportDefaultSpecifier': {
- obj = functions.default
- break
- }
- case 'ImportNamespaceSpecifier': {
- obj = functions
- break
- }
- }
-
- defineVariable(context, spec.local.name, obj, true)
- }
- yield* leave(context)
- }
- } catch (error) {
- handleRuntimeError(context, error)
- }
-
- const newProgram = create.blockStatement(otherNodes)
- const result = yield* forceIt(yield* evaluateBlockStatement(context, newProgram), context)
-
- yield* leave(context) // Done visiting program
-
- if (result instanceof Closure) {
- Object.defineProperty(getNonEmptyEnv(currentEnvironment(context)).head, uniqueId(context), {
- value: result,
- writable: false,
- enumerable: true
- })
- }
- return result
-}
-
-function* evaluate(node: Node, context: Context) {
- yield* visit(context, node)
- const result = yield* evaluators[node.type](node, context)
- yield* leave(context)
- if (result instanceof Closure) {
- Object.defineProperty(getNonEmptyEnv(currentEnvironment(context)).head, uniqueId(context), {
- value: result,
- writable: false,
- enumerable: true
- })
- }
- return result
-}
-
-export function* apply(
- context: Context,
- fun: Closure | Value,
- args: (Thunk | Value)[],
- node: es.CallExpression,
- thisContext?: Value
-) {
- let result: Value
- let total = 0
-
- while (!(result instanceof ReturnValue)) {
- if (fun instanceof Closure) {
- checkNumberOfArguments(context, fun, args, node!)
- const environment = createEnvironment(context, fun, args, node)
- if (result instanceof TailCallReturnValue) {
- replaceEnvironment(context, environment)
- } else {
- pushEnvironment(context, environment)
- total++
- }
- const bodyEnvironment = createBlockEnvironment(context, 'functionBodyEnvironment')
- bodyEnvironment.thisContext = thisContext
- pushEnvironment(context, bodyEnvironment)
- result = yield* evaluateBlockStatement(context, fun.node.body as es.BlockStatement)
- popEnvironment(context)
- if (result instanceof TailCallReturnValue) {
- fun = result.callee
- node = result.node
- args = result.args
- } else if (!(result instanceof ReturnValue)) {
- // No Return Value, set it as undefined
- result = new ReturnValue(undefined)
- }
- } else if (typeof fun === 'function') {
- checkNumberOfArguments(context, fun, args, node!)
- try {
- const forcedArgs = []
-
- for (const arg of args) {
- forcedArgs.push(yield* forceIt(arg, context))
- }
-
- result = fun.apply(thisContext, forcedArgs)
- break
- } catch (e) {
- // Recover from exception
- context.runtime.environments = context.runtime.environments.slice(
- -context.numberOfOuterEnvironments
- )
-
- const loc = node.loc ?? UNKNOWN_LOCATION
- if (!(e instanceof RuntimeSourceError || e instanceof errors.ExceptionError)) {
- // The error could've arisen when the builtin called a source function which errored.
- // If the cause was a source error, we don't want to include the error.
- // However if the error came from the builtin itself, we need to handle it.
- return handleRuntimeError(context, new errors.ExceptionError(e, loc))
- }
- result = undefined
- throw e
- }
- } else {
- return handleRuntimeError(context, new errors.CallingNonFunctionValue(fun, node))
- }
- }
- // Unwraps return value and release stack environment
- if (result instanceof ReturnValue) {
- result = result.value
- }
- for (let i = 1; i <= total; i++) {
- popEnvironment(context)
- }
- return result
-}
From 2066efa8dca9bfe2cf28fa94e6f0527b0a030737 Mon Sep 17 00:00:00 2001
From: "DESKTOP-G08HS3B\\Lee Yi" <leeyi45@gmail.com>
Date: Mon, 3 Mar 2025 15:38:54 -0500
Subject: [PATCH 04/17] Remove interpreter and refactor tests
---
.../__snapshots__/block-scoping.ts.snap | 216 -
src/__tests__/__snapshots__/display.ts.snap | 184 -
src/__tests__/__snapshots__/draw_data.ts.snap | 49 -
src/__tests__/__snapshots__/index.ts.snap | 783 -
src/__tests__/__snapshots__/inspect.ts.snap | 2761 -
.../__snapshots__/return-regressions.ts.snap | 359 -
src/__tests__/__snapshots__/stdlib.ts.snap | 828 +-
src/__tests__/__snapshots__/stringify.ts.snap | 543 -
.../__snapshots__/tailcall-return.ts.snap | 169 -
src/__tests__/block-scoping.ts | 30 +-
src/__tests__/display.ts | 77 +-
src/__tests__/environment.ts | 7 +-
src/__tests__/environmentTree.ts | 4 +-
src/__tests__/index.ts | 294 +-
src/__tests__/inspect.ts | 483 -
src/__tests__/return-regressions.ts | 30 +-
src/__tests__/stdlib.ts | 5 +-
src/__tests__/stringify-benchmark.ts | 3 +-
src/__tests__/stringify.ts | 54 +-
src/__tests__/tailcall-return.ts | 33 +-
src/alt-langs/__tests__/mapper.ts | 2 +-
.../scheme/__tests__/scheme-parser.ts | 2 +-
.../cse-machine-callcc-js.ts.snap | 77 -
.../__snapshots__/cse-machine-callcc.ts.snap | 100 -
.../__snapshots__/cse-machine-errors.ts.snap | 1049 -
.../cse-machine-return-regressions.ts.snap | 359 -
.../__snapshots__/cse-machine-stdlib.ts.snap | 620 +-
.../__snapshots__/cse-machine.ts.snap | 568 -
.../__snapshots__/cset-machine-apply.ts.snap | 84 -
.../__snapshots__/cset-machine-eval.ts.snap | 224 -
.../__snapshots__/cset-machine-macros.ts.snap | 97 -
.../__snapshots__/cset-machine.ts.snap | 376 -
src/cse-machine/__tests__/continuations.ts | 2 +-
.../__tests__/cse-machine-errors.ts | 28 +-
src/cse-machine/__tests__/cse-machine-heap.ts | 6 +-
.../__tests__/cse-machine-runtime-context.ts | 2 +-
.../__tests__/cse-machine-stdlib.ts | 6 +-
.../__tests__/cse-machine-unique-id.ts | 2 +-
src/index.ts | 1 -
src/infiniteLoops/__tests__/errors.ts | 2 +-
src/infiniteLoops/__tests__/instrument.ts | 36 +-
src/infiniteLoops/__tests__/runtime.ts | 2 +-
src/modules/loader/__tests__/loader.ts | 4 +-
.../loader/__tests__/requireProvider.ts | 2 +-
.../preprocessor/__tests__/analyzer.ts | 2 +-
src/modules/preprocessor/__tests__/linker.ts | 2 +-
.../preprocessor/__tests__/preprocessor.ts | 2 +-
.../transformers/hoistAndMergeImports.ts | 2 +-
.../__tests__/transformers/removeExports.ts | 2 +-
.../transformProgramToFunctionDeclaration.ts | 2 +-
src/name-extractor/__tests__/modules.ts | 4 +-
.../__snapshots__/allowed-syntax.ts.snap | 423173 ++++++++++++++-
.../__snapshots__/disallowed-syntax.ts.snap | 1471 -
.../__tests__/__snapshots__/tokenize.ts.snap | 262 -
src/parser/__tests__/allowed-syntax.ts | 16 +-
src/parser/__tests__/disallowed-syntax.ts | 8 +-
src/parser/__tests__/fullTS.ts | 2 +-
src/parser/__tests__/python.ts | 2 +-
src/parser/__tests__/tokenize.ts | 56 +-
src/repl/__tests__/__snapshots__/svmc.ts.snap | 138 +
.../__snapshots__/transpiler.ts.snap | 199 +
src/repl/__tests__/repl.ts | 2 +-
src/repl/__tests__/svmc.ts | 19 +-
src/repl/__tests__/transpiler.ts | 4 +-
src/runner/__tests__/files.ts | 2 +-
src/runner/__tests__/modules.ts | 4 +-
src/runner/__tests__/runners.ts | 14 +-
src/runner/sourceRunner.ts | 3 +-
.../__tests__/__snapshots__/list.ts.snap | 1098 -
.../__snapshots__/localImport.ts.snap | 116 -
.../__tests__/__snapshots__/misc.ts.snap | 280 -
.../__snapshots__/parser-errors.ts.snap | 27 -
.../__tests__/__snapshots__/parser.ts.snap | 131804 +++++
.../__tests__/__snapshots__/pylib.ts.snap | 352 -
.../__tests__/__snapshots__/stream.ts.snap | 303 -
src/stdlib/__tests__/list-benchmark.ts | 1 -
src/stdlib/__tests__/list.ts | 279 +-
src/stdlib/__tests__/localImport.ts | 12 +-
src/stdlib/__tests__/misc.ts | 22 +-
src/stdlib/__tests__/parser.ts | 32 +-
src/stdlib/__tests__/pylib.ts | 54 +-
src/stdlib/__tests__/stream.ts | 113 +-
src/stdlib/misc.ts | 2 +-
src/stepper/__tests__/stepper.ts | 2 +-
src/stepper/converter.ts | 4 +-
src/transpiler/__tests__/native.ts | 2 +-
src/transpiler/__tests__/transpiled-code.ts | 2 +-
.../__tests__/source1Typed.test.ts | 2 +-
.../__tests__/source2Typed.test.ts | 2 +-
.../__tests__/source3Typed.test.ts | 2 +-
.../__tests__/source4Typed.test.ts | 2 +-
.../__tests__/source4TypedModules.test.ts | 2 +-
src/utils/__tests__/rttc.ts | 2 +-
src/utils/stringify.ts | 2 +-
src/utils/testing/__tests__/testing.ts | 47 +
src/utils/testing/index.ts | 439 +-
src/utils/testing/misc.ts | 20 +-
.../context.ts => utils/testing/mocks.ts} | 35 +-
src/utils/testing/types.ts | 23 +
.../__tests__/__snapshots__/validator.ts.snap | 32 -
src/validator/__tests__/validator.ts | 2 +-
.../__snapshots__/svml-machine.ts.snap | 1735 -
102 files changed, 551865 insertions(+), 20941 deletions(-)
delete mode 100644 src/__tests__/__snapshots__/block-scoping.ts.snap
delete mode 100644 src/__tests__/__snapshots__/display.ts.snap
delete mode 100644 src/__tests__/__snapshots__/draw_data.ts.snap
delete mode 100644 src/__tests__/__snapshots__/inspect.ts.snap
delete mode 100644 src/__tests__/__snapshots__/return-regressions.ts.snap
delete mode 100644 src/__tests__/__snapshots__/stringify.ts.snap
delete mode 100644 src/__tests__/__snapshots__/tailcall-return.ts.snap
delete mode 100644 src/__tests__/inspect.ts
delete mode 100644 src/cse-machine/__tests__/__snapshots__/cse-machine-callcc-js.ts.snap
delete mode 100644 src/cse-machine/__tests__/__snapshots__/cse-machine-callcc.ts.snap
delete mode 100644 src/cse-machine/__tests__/__snapshots__/cse-machine-errors.ts.snap
delete mode 100644 src/cse-machine/__tests__/__snapshots__/cse-machine-return-regressions.ts.snap
delete mode 100644 src/cse-machine/__tests__/__snapshots__/cse-machine.ts.snap
delete mode 100644 src/cse-machine/__tests__/__snapshots__/cset-machine-apply.ts.snap
delete mode 100644 src/cse-machine/__tests__/__snapshots__/cset-machine-eval.ts.snap
delete mode 100644 src/cse-machine/__tests__/__snapshots__/cset-machine-macros.ts.snap
delete mode 100644 src/cse-machine/__tests__/__snapshots__/cset-machine.ts.snap
delete mode 100644 src/parser/__tests__/__snapshots__/disallowed-syntax.ts.snap
delete mode 100644 src/parser/__tests__/__snapshots__/tokenize.ts.snap
create mode 100644 src/repl/__tests__/__snapshots__/svmc.ts.snap
create mode 100644 src/repl/__tests__/__snapshots__/transpiler.ts.snap
delete mode 100644 src/stdlib/__tests__/__snapshots__/list.ts.snap
delete mode 100644 src/stdlib/__tests__/__snapshots__/localImport.ts.snap
delete mode 100644 src/stdlib/__tests__/__snapshots__/misc.ts.snap
delete mode 100644 src/stdlib/__tests__/__snapshots__/parser-errors.ts.snap
create mode 100644 src/stdlib/__tests__/__snapshots__/parser.ts.snap
delete mode 100644 src/stdlib/__tests__/__snapshots__/pylib.ts.snap
delete mode 100644 src/stdlib/__tests__/__snapshots__/stream.ts.snap
create mode 100644 src/utils/testing/__tests__/testing.ts
rename src/{mocks/context.ts => utils/testing/mocks.ts} (64%)
create mode 100644 src/utils/testing/types.ts
delete mode 100644 src/vm/__tests__/__snapshots__/svml-machine.ts.snap
diff --git a/src/__tests__/__snapshots__/block-scoping.ts.snap b/src/__tests__/__snapshots__/block-scoping.ts.snap
deleted file mode 100644
index dc267db9d..000000000
--- a/src/__tests__/__snapshots__/block-scoping.ts.snap
+++ /dev/null
@@ -1,216 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Cannot overwrite loop variables within a block: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- let z = [];
- for (let x = 0; x < 2; x = x + 1) {
- x = 1;
- }
- return false;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 4: Assignment to a for loop variable in the for loop is not allowed.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when accessing temporal dead zone: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const a = 1;
-function f() {
- display(a);
- const a = 5;
-}
-f();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3: Name a declared later in current scope but not yet assigned",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`In a block, every going-to-be-defined variable in the block cannot be accessed until it has been defined in the block.: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const a = 1;
-{
- a + a;
- const a = 10;
-}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3: Name a declared later in current scope but not yet assigned",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No hoisting of functions. Only the name is hoisted like let and const: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const v = f();
-function f() {
- return 1;
-}
-v;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Name f declared later in current scope but not yet assigned",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Shadowed variables may not be assigned to until declared in the current scope: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let variable = 1;
-function test(){
- variable = 100;
- let variable = true;
- return variable;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3: Name variable not declared.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`const uses block scoping instead of function scoping: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- const x = true;
- if(true) {
- const x = false;
- } else {
- const x = false;
- }
- return x;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`for loop \`let\` variables are copied into the block scope: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- let z = [];
- for (let x = 0; x < 10; x = x + 1) {
- z[x] = () => x;
- }
- return z[1]();
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`for loops use block scoping instead of function scoping: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- let x = true;
- for (let x = 1; x > 0; x = x - 1) {
- }
- return x;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`let uses block scoping instead of function scoping: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- let x = true;
- if(true) {
- let x = false;
- } else {
- let x = false;
- }
- return x;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`standalone block statements: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- const x = true;
- {
- const x = false;
- }
- return x;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`while loops use block scoping instead of function scoping: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- let x = true;
- while (true) {
- let x = false;
- break;
- }
- return x;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/__tests__/__snapshots__/display.ts.snap b/src/__tests__/__snapshots__/display.ts.snap
deleted file mode 100644
index 17d11e49e..000000000
--- a/src/__tests__/__snapshots__/display.ts.snap
+++ /dev/null
@@ -1,184 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`display can be used to display (escaped) strings: expectDisplayResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display(\\"Tom's assisstant said: \\\\\\"tuna.\\\\\\"\\");",
- "displayResult": Array [
- "\\"Tom's assisstant said: \\\\\\"tuna.\\\\\\"\\"",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "Tom's assisstant said: \\"tuna.\\"",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`display can be used to display arrays: expectDisplayResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display([1, 2, [4, 5]]);",
- "displayResult": Array [
- "[1, 2, [4, 5]]",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- 1,
- 2,
- Array [
- 4,
- 5,
- ],
- ],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`display can be used to display functions: expectDisplayResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display(x => x); display((x, y) => x + y);",
- "displayResult": Array [
- "x => x",
- "(x, y) => x + y",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": [Function],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`display can be used to display funny numbers: expectDisplayResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display(1e38); display(NaN); display(Infinity);",
- "displayResult": Array [
- "1e+38",
- "NaN",
- "Infinity",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Infinity,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`display can be used to display lists: expectDisplayResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display(list(1, 2));",
- "displayResult": Array [
- "[1, [2, null]]",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- 1,
- Array [
- 2,
- null,
- ],
- ],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`display can be used to display numbers: expectDisplayResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display(0);",
- "displayResult": Array [
- "0",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 0,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`display can be used to display objects: expectDisplayResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display({a: 1, b: 2, c: {d: 3}});",
- "displayResult": Array [
- "{\\"a\\": 1, \\"b\\": 2, \\"c\\": {\\"d\\": 3}}",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Object {
- "a": 1,
- "b": 2,
- "c": Object {
- "d": 3,
- },
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`display second argument can be a string: expectDisplayResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display(31072020, \\"my_first_String\\");",
- "displayResult": Array [
- "my_first_String 31072020",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 31072020,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`display throw error if second argument is non-string when used: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display(31072020, 0xDEADC0DE);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: TypeError: display expects the second argument to be a string",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`display with no arguments throws an error: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected 1 or more arguments, but got 0.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`raw_display can be used to display (unescaped) strings directly: expectDisplayResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "raw_display(\\"Tom's assisstant said: \\\\\\"tuna.\\\\\\"\\");",
- "displayResult": Array [
- "Tom's assisstant said: \\"tuna.\\"",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "Tom's assisstant said: \\"tuna.\\"",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/__tests__/__snapshots__/draw_data.ts.snap b/src/__tests__/__snapshots__/draw_data.ts.snap
deleted file mode 100644
index 065789fe5..000000000
--- a/src/__tests__/__snapshots__/draw_data.ts.snap
+++ /dev/null
@@ -1,49 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`draw_data returns first argument if exactly one argument: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "draw_data(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [
- Array [
- 1,
- ],
- ],
-}
-`;
-
-exports[`draw_data returns first argument if more than one argument: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "draw_data(1, 2);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [
- Array [
- 1,
- 2,
- ],
- ],
-}
-`;
-
-exports[`draw_data with no arguments throws error: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "draw_data();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected 1 or more arguments, but got 0.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/__tests__/__snapshots__/index.ts.snap b/src/__tests__/__snapshots__/index.ts.snap
index 2339d62aa..6c7570d78 100644
--- a/src/__tests__/__snapshots__/index.ts.snap
+++ b/src/__tests__/__snapshots__/index.ts.snap
@@ -1,230 +1,5 @@
// Jest Snapshot v1, https://goo.gl/fbAQLP
-exports[`Accessing array with nonexistent index returns undefined: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const a = [];
-a[1];",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": undefined,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Accessing object with nonexistent property returns undefined: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const o = {};
-o.nonexistent;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": undefined,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Allow display to return value it is displaying: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "25*(display(1+1));",
- "displayResult": Array [
- "2",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 50,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Array assignment has value: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let arr = [];
-const a = arr[0] = 1;
-const b = arr[1] = arr[2] = 4;
-arr[0] === 1 && arr[1] === 4 && arr[2] === 4;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Arrays toString matches up with JS: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "toString([1, 2]);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "1,2",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Arrow function definition returns itself: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "() => 42;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": [Function],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Arrow function infinite recursion with list args represents CallExpression well: expectParsedErrorNoErrorSnapshot 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = xs => append(f(xs), list());
-f(list(1, 2));",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Maximum call stack size exceeded
- f([1, [2, null]]).. f([1, [2, null]]).. f([1, [2, null]])..",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Assignment has value: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let a = 1;
-let b = a = 4;
-b === 4 && a === 4;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins hide their implementation when stringify: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(pair);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "function pair(left, right) {
- [implementation hidden]
-}",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins hide their implementation when toString: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "toString(pair);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "function pair(left, right) {
- [implementation hidden]
-}",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Can overwrite lets when assignment is allowed: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test() {
- let variable = false;
- variable = true;
- return variable;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Cannot overwrite consts even when assignment is allowed: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- const constant = 3;
- constant = 4;
- return constant;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3: Cannot assign new value to constant constant.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Deep object assignment and retrieval: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const o = {};
-o.a = {};
-o.a.b = {};
-o.a.b.c = \\"string\\";
-o.a.b.c;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "string",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Empty code returns undefined: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": undefined,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Factorial arrow function: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const fac = (i) => i === 1 ? 1 : i * fac(i-1);
-fac(5);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 120,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
exports[`Find arrow function declaration 1`] = `
SourceLocation {
"end": Position {
@@ -547,561 +322,3 @@ SourceLocation {
},
}
`;
-
-exports[`Function infinite recursion with list args represents CallExpression well: expectParsedErrorNoErrorSnapshot 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(xs) { return append(f(xs), list()); }
-f(list(1, 2));",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Maximum call stack size exceeded
- f([1, [2, null]]).. f([1, [2, null]]).. f([1, [2, null]])..",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Functions passed into non-source functions remain equal: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function t(x, y, z) {
- return x + y + z;
-}
-identity(t) === t && t(1, 2, 3) === 6;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Multiline string self-evaluates to itself: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\`1
-1\`;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "1
-1",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Objects toString matches up with JS: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "toString({a: 1});",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[object Object]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Rest parameters work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function rest(a, b, ...c) {
- let sum = a + b;
- for (let i = 0; i < array_length(c); i = i + 1) {
- sum = sum + c[i];
- }
- return sum;
-}
-rest(1, 2); // no error
-rest(1, 2, ...[3, 4, 5], ...[6, 7], ...[]);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 28,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Simple arrow function infinite recursion represents CallExpression well: expectParsedErrorNoErrorSnapshot 1`] = `
-Object {
- "alertResult": Array [],
- "code": "(x => x(x)(x))(x => x(x)(x));",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Maximum call stack size exceeded
- x(x => x(x)(x)).. x(x => x(x)(x)).. x(x => x(x)(x))..",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Simple function infinite recursion represents CallExpression well: expectParsedErrorNoErrorSnapshot 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x) {return x(x)(x);} f(f);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Maximum call stack size exceeded
- x(function f(x) {
- return x(x)(x);
-}).. x(function f(x) {
- return x(x)(x);
-}).. x(function f(x) {
- return x(x)(x);
-})..",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Simple object assignment and retrieval: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const o = {};
-o.a = 1;
-o.a;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Single boolean self-evaluates to itself: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "true;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Single number self-evaluates to itself: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "42;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 42,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Single string self-evaluates to itself: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "'42';",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "42",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Test apply_in_underlying_javascript: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "apply_in_underlying_javascript((a, b, c) => a * b * c, list(2, 5, 6));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 60,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Test context reuse: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let i = 0;
-function f() {
- i = i + 1;
- return i;
-}
-i;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 0,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Test context reuse: expectResult 2`] = `
-Object {
- "alertResult": Array [],
- "code": "i = 100; f();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 101,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Test context reuse: expectResult 3`] = `
-Object {
- "alertResult": Array [],
- "code": "f(); i;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 102,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Test context reuse: expectResult 4`] = `
-Object {
- "alertResult": Array [],
- "code": "i;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 102,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Test equal for different lists: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "!equal(list(1, 2), pair(1, 2)) && !equal(list(1, 2, 3), list(1, list(2, 3)));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Test equal for lists: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "equal(list(1, 2), pair(1, pair(2, null))) && equal(list(1, 2, 3, 4), list(1, 2, 3, 4));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Test equal for primitives: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "equal(1, 1) && equal(\\"str\\", \\"str\\") && equal(null, null) && !equal(1, 2) && !equal(\\"str\\", \\"\\");",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`false if with empty else works: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "if (false) {
-} else {
-}",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": undefined,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`false if with nonempty if works: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "if (false) {
-} else {
- 2;
-}",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 2,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`functions toString (mostly) matches up with JS: expect to loosely match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x) {
- return 5;
-}
-toString(a=>a) + toString(f);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "a => afunction f(x) {
- return 5;
-}",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`parseError for missing semicolon: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "42",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Missing semicolon at the end of statement",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`parseError for template literals with expressions: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\`\${1}\`;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expressions are not allowed in template literals (\`multiline strings\`)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`primitives toString matches up with JS: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "toString(true) +
-toString(false) +
-toString(1) +
-toString(1.5) +
-toString(null) +
-toString(undefined) +
-toString(NaN);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "truefalse11.5nullundefinedNaN",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test && shortcircuiting: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "false && 1();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test || shortcircuiting: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "true || 1();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test false && false: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "false && false;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test false && true: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "false && true;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test false || false: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "false || false;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test false || true: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "false || true;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test false conditional expression: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "false ? true : false;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test true && false: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "true && false;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test true && true: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "true && true;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test true || false: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "true || false;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test true || true: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "true || true;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`test true conditional expression: expect to match JS 1`] = `
-Object {
- "alertResult": Array [],
- "code": "true ? true : false;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`true if with empty if works: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "if (true) {
-} else {
-}",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": undefined,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`true if with nonempty if works: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "if (true) {
- 1;
-} else {
-}",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/__tests__/__snapshots__/inspect.ts.snap b/src/__tests__/__snapshots__/inspect.ts.snap
deleted file mode 100644
index ee1749372..000000000
--- a/src/__tests__/__snapshots__/inspect.ts.snap
+++ /dev/null
@@ -1,2761 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`debugger; pauses for 1`] = `
-Object {
- "head": Object {
- "i": 0,
- },
- "id": Any<String>,
- "name": "blockEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; pauses for 2`] = `
-Object {
- "head": Object {
- "_copy_of_i": 0,
- },
- "id": Any<String>,
- "name": "blockEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; pauses for 3`] = `
-Object {
- "head": Object {
- "i": 0,
- },
- "id": Any<String>,
- "name": "blockEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; pauses for 4`] = `
-Object {
- "callExpression": Object {
- "arguments": Array [
- Object {
- "loc": undefined,
- "type": "Literal",
- "value": 10,
- },
- ],
- "callee": Node {
- "end": 78,
- "loc": SourceLocation {
- "end": Position {
- "column": 3,
- "line": 7,
- },
- "start": Position {
- "column": 2,
- "line": 7,
- },
- },
- "name": "a",
- "start": 77,
- "type": "Identifier",
- },
- "end": 82,
- "loc": SourceLocation {
- "end": Position {
- "column": 7,
- "line": 7,
- },
- "start": Position {
- "column": 2,
- "line": 7,
- },
- },
- "start": 77,
- "type": "CallExpression",
- },
- "head": Object {
- "x": 10,
- },
- "id": Any<String>,
- "name": "a",
- "tail": null,
-}
-`;
-
-exports[`debugger; pauses for 5`] = `
-Object {
- "head": Object {
- "a": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; pauses for 6`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; pauses for 7`] = `""`;
-
-exports[`debugger; pauses while 1`] = `
-Object {
- "callExpression": Object {
- "arguments": Array [
- Object {
- "loc": undefined,
- "type": "Literal",
- "value": 10,
- },
- ],
- "callee": Node {
- "end": 78,
- "loc": SourceLocation {
- "end": Position {
- "column": 3,
- "line": 8,
- },
- "start": Position {
- "column": 2,
- "line": 8,
- },
- },
- "name": "a",
- "start": 77,
- "type": "Identifier",
- },
- "end": 82,
- "loc": SourceLocation {
- "end": Position {
- "column": 7,
- "line": 8,
- },
- "start": Position {
- "column": 2,
- "line": 8,
- },
- },
- "start": 77,
- "type": "CallExpression",
- },
- "head": Object {
- "x": 10,
- },
- "id": Any<String>,
- "name": "a",
- "tail": null,
-}
-`;
-
-exports[`debugger; pauses while 2`] = `
-Object {
- "head": Object {
- "a": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; pauses while 3`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; pauses while 4`] = `""`;
-
-exports[`debugger; statement basic test 1`] = `
-Object {
- "head": Object {
- "a": 2,
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement basic test 2`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement basic test 3`] = `""`;
-
-exports[`debugger; statement execution sequence 1`] = `
-Object {
- "head": Object {
- "a": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement execution sequence 2`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement execution sequence 3`] = `""`;
-
-exports[`debugger; statement hoisting 1`] = `
-Object {
- "head": Object {
- "b": Symbol(Used to implement hoisting),
- "c": Symbol(Used to implement hoisting),
- "z": Symbol(Used to implement hoisting),
- },
- "id": Any<String>,
- "name": "blockEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement hoisting 2`] = `
-Object {
- "callExpression": Object {
- "arguments": Array [
- Object {
- "loc": undefined,
- "type": "Literal",
- "value": 10,
- },
- ],
- "callee": Node {
- "end": 108,
- "loc": SourceLocation {
- "end": Position {
- "column": 3,
- "line": 9,
- },
- "start": Position {
- "column": 2,
- "line": 9,
- },
- },
- "name": "a",
- "start": 107,
- "type": "Identifier",
- },
- "end": 112,
- "loc": SourceLocation {
- "end": Position {
- "column": 7,
- "line": 9,
- },
- "start": Position {
- "column": 2,
- "line": 9,
- },
- },
- "start": 107,
- "type": "CallExpression",
- },
- "head": Object {
- "x": 10,
- },
- "id": Any<String>,
- "name": "a",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement hoisting 3`] = `
-Object {
- "head": Object {
- "a": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement hoisting 4`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement hoisting 5`] = `""`;
-
-exports[`debugger; statement in function 1`] = `
-Object {
- "callExpression": Object {
- "arguments": Array [
- Object {
- "loc": undefined,
- "type": "Literal",
- "value": 10,
- },
- ],
- "callee": Node {
- "end": 53,
- "loc": SourceLocation {
- "end": Position {
- "column": 3,
- "line": 6,
- },
- "start": Position {
- "column": 2,
- "line": 6,
- },
- },
- "name": "a",
- "start": 52,
- "type": "Identifier",
- },
- "end": 57,
- "loc": SourceLocation {
- "end": Position {
- "column": 7,
- "line": 6,
- },
- "start": Position {
- "column": 2,
- "line": 6,
- },
- },
- "start": 52,
- "type": "CallExpression",
- },
- "head": Object {
- "x": 10,
- },
- "id": Any<String>,
- "name": "a",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement in function 2`] = `
-Object {
- "head": Object {
- "a": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement in function 3`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement in function 4`] = `""`;
-
-exports[`debugger; statement test function scope 1`] = `
-Object {
- "head": Object {
- "b": 100,
- "c": 200,
- "d": 300,
- "e": 30000,
- "f": 60000,
- "g": 2000,
- "h": 2300,
- "i": 666.6666666666666,
- "j": 600,
- "k": 0.0033333333333333335,
- "l": 0.5,
- },
- "id": Any<String>,
- "name": "blockEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement test function scope 2`] = `
-Object {
- "callExpression": Object {
- "arguments": Array [
- Object {
- "loc": undefined,
- "type": "Literal",
- "value": 10,
- },
- ],
- "callee": Node {
- "end": 266,
- "loc": SourceLocation {
- "end": Position {
- "column": 3,
- "line": 17,
- },
- "start": Position {
- "column": 2,
- "line": 17,
- },
- },
- "name": "a",
- "start": 265,
- "type": "Identifier",
- },
- "end": 270,
- "loc": SourceLocation {
- "end": Position {
- "column": 7,
- "line": 17,
- },
- "start": Position {
- "column": 2,
- "line": 17,
- },
- },
- "start": 265,
- "type": "CallExpression",
- },
- "head": Object {
- "x": 10,
- },
- "id": Any<String>,
- "name": "a",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement test function scope 3`] = `
-Object {
- "head": Object {
- "a": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement test function scope 4`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`debugger; statement test function scope 5`] = `""`;
-
-exports[`setBreakpointAtLine basic 1`] = `
-Object {
- "head": Object {
- "a": Symbol(Used to implement hoisting),
- "b": Symbol(Used to implement hoisting),
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine basic 2`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine basic 3`] = `""`;
-
-exports[`setBreakpointAtLine for loops 1`] = `
-Object {
- "head": Object {
- "b": Symbol(Used to implement hoisting),
- },
- "id": Any<String>,
- "name": "blockEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine for loops 2`] = `
-Object {
- "head": Object {
- "i": 1,
- },
- "id": Any<String>,
- "name": "blockEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine for loops 3`] = `
-Object {
- "head": Object {
- "_copy_of_i": 1,
- },
- "id": Any<String>,
- "name": "blockEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine for loops 4`] = `
-Object {
- "head": Object {
- "i": 1,
- },
- "id": Any<String>,
- "name": "blockEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine for loops 5`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine for loops 6`] = `""`;
-
-exports[`setBreakpointAtLine for loops 7`] = `
-Array [
- Object {
- "head": Object {
- "b": Symbol(Used to implement hoisting),
- },
- "id": "95",
- "name": "blockEnvironment",
- "tail": null,
- },
- Object {
- "head": Object {
- "i": 2,
- },
- "id": "94",
- "name": "blockEnvironment",
- "tail": null,
- },
- Object {
- "head": Object {
- "_copy_of_i": 2,
- },
- "id": "93",
- "name": "blockEnvironment",
- "tail": null,
- },
- Object {
- "head": Object {
- "i": 2,
- },
- "id": "89",
- "name": "blockEnvironment",
- "tail": null,
- },
- Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
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- "callee": Node {
- "end": 58,
- "loc": SourceLocation {
- "end": Position {
- "column": 5,
- "line": 5,
- },
- "start": Position {
- "column": 4,
- "line": 5,
- },
- },
- "name": "a",
- "start": 57,
- "type": "Identifier",
- },
- "end": 69,
- "loc": SourceLocation {
- "end": Position {
- "column": 16,
- "line": 5,
- },
- "start": Position {
- "column": 4,
- "line": 5,
- },
- },
- "start": 57,
- "type": "CallExpression",
- },
- "head": Object {
- "ctrlf": -1,
- },
- "id": Any<String>,
- "name": "a",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine granularity 2 2`] = `
-Object {
- "callExpression": Object {
- "arguments": Array [
- Object {
- "loc": undefined,
- "type": "Literal",
- "value": 0,
- },
- ],
- "callee": Node {
- "end": 58,
- "loc": SourceLocation {
- "end": Position {
- "column": 5,
- "line": 5,
- },
- "start": Position {
- "column": 4,
- "line": 5,
- },
- },
- "name": "a",
- "start": 57,
- "type": "Identifier",
- },
- "end": 69,
- "loc": SourceLocation {
- "end": Position {
- "column": 16,
- "line": 5,
- },
- "start": Position {
- "column": 4,
- "line": 5,
- },
- },
- "start": 57,
- "type": "CallExpression",
- },
- "head": Object {
- "ctrlf": 0,
- },
- "id": Any<String>,
- "name": "a",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine granularity 2 3`] = `
-Object {
- "callExpression": Object {
- "arguments": Array [
- Object {
- "loc": undefined,
- "type": "Literal",
- "value": 1,
- },
- ],
- "callee": Node {
- "end": 78,
- "loc": SourceLocation {
- "end": Position {
- "column": 3,
- "line": 7,
- },
- "start": Position {
- "column": 2,
- "line": 7,
- },
- },
- "name": "a",
- "start": 77,
- "type": "Identifier",
- },
- "end": 81,
- "loc": SourceLocation {
- "end": Position {
- "column": 6,
- "line": 7,
- },
- "start": Position {
- "column": 2,
- "line": 7,
- },
- },
- "start": 77,
- "type": "CallExpression",
- },
- "head": Object {
- "ctrlf": 1,
- },
- "id": Any<String>,
- "name": "a",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine granularity 2 4`] = `
-Object {
- "head": Object {
- "a": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine granularity 2 5`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine granularity 2 6`] = `""`;
-
-exports[`setBreakpointAtLine granularity 2 7`] = `
-Array [
- Object {
- "head": Object {
- "a": [Function],
- },
- "id": "66",
- "name": "programEnvironment",
- "tail": null,
- },
- Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
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- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": "65",
- "name": "programEnvironment",
- "tail": null,
- },
-]
-`;
-
-exports[`setBreakpointAtLine granularity 2 8`] = `""`;
-
-exports[`setBreakpointAtLine granularity 3 1`] = `
-Object {
- "callExpression": Object {
- "arguments": Array [
- Object {
- "loc": undefined,
- "type": "Literal",
- "value": 1,
- },
- ],
- "callee": Node {
- "end": 78,
- "loc": SourceLocation {
- "end": Position {
- "column": 3,
- "line": 7,
- },
- "start": Position {
- "column": 2,
- "line": 7,
- },
- },
- "name": "a",
- "start": 77,
- "type": "Identifier",
- },
- "end": 81,
- "loc": SourceLocation {
- "end": Position {
- "column": 6,
- "line": 7,
- },
- "start": Position {
- "column": 2,
- "line": 7,
- },
- },
- "start": 77,
- "type": "CallExpression",
- },
- "head": Object {
- "ctrlf": 1,
- },
- "id": Any<String>,
- "name": "a",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine granularity 3 2`] = `
-Object {
- "head": Object {
- "a": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine granularity 3 3`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine granularity 3 4`] = `""`;
-
-exports[`setBreakpointAtLine granularity 3 5`] = `
-Array [
- Object {
- "callExpression": Object {
- "arguments": Array [
- Object {
- "loc": undefined,
- "type": "Literal",
- "value": 0,
- },
- ],
- "callee": Node {
- "end": 58,
- "loc": SourceLocation {
- "end": Position {
- "column": 5,
- "line": 5,
- },
- "start": Position {
- "column": 4,
- "line": 5,
- },
- },
- "name": "a",
- "start": 57,
- "type": "Identifier",
- },
- "end": 69,
- "loc": SourceLocation {
- "end": Position {
- "column": 16,
- "line": 5,
- },
- "start": Position {
- "column": 4,
- "line": 5,
- },
- },
- "start": 57,
- "type": "CallExpression",
- },
- "head": Object {
- "ctrlf": 0,
- },
- "id": "81",
- "name": "a",
- "tail": null,
- },
- Object {
- "callExpression": Object {
- "arguments": Array [
- Object {
- "loc": undefined,
- "type": "Literal",
- "value": 1,
- },
- ],
- "callee": Node {
- "end": 78,
- "loc": SourceLocation {
- "end": Position {
- "column": 3,
- "line": 7,
- },
- "start": Position {
- "column": 2,
- "line": 7,
- },
- },
- "name": "a",
- "start": 77,
- "type": "Identifier",
- },
- "end": 81,
- "loc": SourceLocation {
- "end": Position {
- "column": 6,
- "line": 7,
- },
- "start": Position {
- "column": 2,
- "line": 7,
- },
- },
- "start": 77,
- "type": "CallExpression",
- },
- "head": Object {
- "ctrlf": 1,
- },
- "id": "78",
- "name": "a",
- "tail": null,
- },
- Object {
- "head": Object {
- "a": [Function],
- },
- "id": "77",
- "name": "programEnvironment",
- "tail": null,
- },
- Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": "76",
- "name": "programEnvironment",
- "tail": null,
- },
-]
-`;
-
-exports[`setBreakpointAtLine granularity 3 6`] = `""`;
-
-exports[`setBreakpointAtLine granularity 3 7`] = `
-Array [
- Object {
- "head": Object {
- "a": [Function],
- },
- "id": "77",
- "name": "programEnvironment",
- "tail": null,
- },
- Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": "76",
- "name": "programEnvironment",
- "tail": null,
- },
-]
-`;
-
-exports[`setBreakpointAtLine granularity 3 8`] = `""`;
-
-exports[`setBreakpointAtLine while loops 1`] = `
-Object {
- "head": Object {
- "a": 9,
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine while loops 2`] = `
-Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": Any<String>,
- "name": "programEnvironment",
- "tail": null,
-}
-`;
-
-exports[`setBreakpointAtLine while loops 3`] = `""`;
-
-exports[`setBreakpointAtLine while loops 4`] = `
-Array [
- Object {
- "head": Object {
- "a": 6,
- },
- "id": "103",
- "name": "programEnvironment",
- "tail": null,
- },
- Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
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- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": "102",
- "name": "programEnvironment",
- "tail": null,
- },
-]
-`;
-
-exports[`setBreakpointAtLine while loops 5`] = `""`;
-
-exports[`setBreakpointAtLine while loops 6`] = `
-Array [
- Object {
- "head": Object {
- "a": 3,
- },
- "id": "103",
- "name": "programEnvironment",
- "tail": null,
- },
- Object {
- "head": Object {
- "$accumulate": [Function],
- "$append": [Function],
- "$build_list": [Function],
- "$enum_list": [Function],
- "$filter": [Function],
- "$length": [Function],
- "$list_to_string": [Function],
- "$map": [Function],
- "$remove": [Function],
- "$remove_all": [Function],
- "$reverse": [Function],
- "__access_export__": [Function],
- "__access_named_export__": [Function],
- "accumulate": [Function],
- "append": [Function],
- "build_list": [Function],
- "build_stream": [Function],
- "enum_list": [Function],
- "enum_stream": [Function],
- "equal": [Function],
- "eval_stream": [Function],
- "filter": [Function],
- "for_each": [Function],
- "integers_from": [Function],
- "is_stream": [Function],
- "length": [Function],
- "list_ref": [Function],
- "list_to_stream": [Function],
- "list_to_string": [Function],
- "map": [Function],
- "member": [Function],
- "remove": [Function],
- "remove_all": [Function],
- "reverse": [Function],
- "stream_append": [Function],
- "stream_filter": [Function],
- "stream_for_each": [Function],
- "stream_length": [Function],
- "stream_map": [Function],
- "stream_member": [Function],
- "stream_ref": [Function],
- "stream_remove": [Function],
- "stream_remove_all": [Function],
- "stream_reverse": [Function],
- "stream_to_list": [Function],
- },
- "id": "102",
- "name": "programEnvironment",
- "tail": null,
- },
-]
-`;
-
-exports[`setBreakpointAtLine while loops 7`] = `""`;
diff --git a/src/__tests__/__snapshots__/return-regressions.ts.snap b/src/__tests__/__snapshots__/return-regressions.ts.snap
deleted file mode 100644
index 4a6940382..000000000
--- a/src/__tests__/__snapshots__/return-regressions.ts.snap
+++ /dev/null
@@ -1,359 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Bare early returns in for loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function f() {
- for (let i = 0; i < 100; i = i + 1) {
- return i+1;
- unreachable();
- }
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Bare early returns in if statements work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function f() {
- if (true) {
- return 1;
- unreachable();
- } else {}
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Bare early returns in while loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function f() {
- while (true) {
- return 1;
- unreachable();
- }
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Bare early returns work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function f() {
- return 1;
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Calling unreachable results in error: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function f() {
- unreachable();
- return 0;
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3: Expected number on right hand side of operation, got boolean.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Recursive call early returns in for loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- for (let i = 0; i < 100; i = i + 1) {
- return id(i+1) + id(i+2);
- }
- return 0;
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 3,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Recursive call early returns in if statements work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- if (true) {
- return id(1) + id(2);
- unreachable();
- } else {}
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 3,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Recursive call early returns in while loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- while (true) {
- return id(1) + id(2);
- unreachable();
- }
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 3,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Recursive call early returns work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- return id(1) + id(2);
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 3,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call early returns in for loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- for (let i = 0; i < 100; i = i + 1) {
- return id(i+1);
- unreachable();
- }
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call early returns in if statements work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- if (true) {
- return id(1);
- unreachable();
- } else {}
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call early returns in while loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- while (true) {
- return id(1);
- unreachable();
- }
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call early returns work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- return id(1);
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/__tests__/__snapshots__/stdlib.ts.snap b/src/__tests__/__snapshots__/stdlib.ts.snap
index 6bfca218b..2efb0a3ad 100644
--- a/src/__tests__/__snapshots__/stdlib.ts.snap
+++ b/src/__tests__/__snapshots__/stdlib.ts.snap
@@ -1,829 +1,13 @@
// Jest Snapshot v1, https://goo.gl/fbAQLP
-exports[`Builtins work as expected 0: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display('message');",
- "displayResult": Array [
- "\\"message\\"",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "message",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 1 1`] = `"Line 1: Error: \\"error!\\""`;
-exports[`Builtins work as expected 1: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "error('error!');",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Error: \\"error!\\"",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 56 1`] = `"Line 1: Error: head(xs) expects a pair as argument xs, but encountered null"`;
-exports[`Builtins work as expected 2: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_undefined(undefined);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 57 1`] = `"Line 1: Error: tail(xs) expects a pair as argument xs, but encountered null"`;
-exports[`Builtins work as expected 3: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_undefined(null);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 58 1`] = `"Line 1: Error: head(xs) expects a pair as argument xs, but encountered 1"`;
-exports[`Builtins work as expected 4: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_null(undefined);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 59 1`] = `"Line 1: Error: tail(xs) expects a pair as argument xs, but encountered 1"`;
-exports[`Builtins work as expected 5: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_null(null);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 6: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_string('string');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 7: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_string('true');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 8: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_string('1');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 9: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_string(true);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 10: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_string(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 11: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number('string');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 12: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number('true');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 13: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number('1');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 14: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number(true);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 15: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 16: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_boolean('string');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 17: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_boolean('true');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 18: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_boolean('1');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 19: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_boolean(true);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 20: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_boolean(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 21: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_function(display);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 22: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_function(x => x);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 23: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x) {
- return x;
-}
-is_function(f);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 24: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_function(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 25: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_array(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 26: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_array(pair(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 27: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_array([1]);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 28: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_object(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 29: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_object(pair(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 30: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_object([1]);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 31: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_object({});",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 32: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_object({a: 1});",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 33: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_object(x => x);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 34: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_object(display);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 35: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_object(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 36: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_object('string');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 37: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_object(true);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 38: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_NaN(1 / 0);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 39: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_NaN(NaN);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 40: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_NaN(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 41: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_NaN(x => x);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 42: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "has_own_property({a: 1, b: 2}, 'a');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 43: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "has_own_property({a: 1, b: 2}, 'c');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 44: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "array_length([1]);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 45: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "parse_int('10', 10);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 46: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "parse_int('10', 2);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 2,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 47: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number(get_time());",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 48: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const start = get_time();
-function repeatUntilDifferentTime() {
- if (start === get_time()) {
- return repeatUntilDifferentTime();
- } else {
- return true;
- }
-}
-repeatUntilDifferentTime();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 49: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "pair(1, 2);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- 1,
- 2,
- ],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 50: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "list(1, 2);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- 1,
- Array [
- 2,
- null,
- ],
- ],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 51: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_list(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 52: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_list(pair(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 53: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_list(list(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 54: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "head(pair(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 55: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "tail(pair(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 2,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 56: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "head(null);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Error: head(xs) expects a pair as argument xs, but encountered null",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 57: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "tail(null);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Error: tail(xs) expects a pair as argument xs, but encountered null",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 58: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "head(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Error: head(xs) expects a pair as argument xs, but encountered 1",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 59: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "tail(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Error: tail(xs) expects a pair as argument xs, but encountered 1",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 60: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "length(list(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 2,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 61: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "length(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 33: Error: tail(xs) expects a pair as argument xs, but encountered 1",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 61 1`] = `"Line 33: Error: tail(xs) expects a pair as argument xs, but encountered 1"`;
diff --git a/src/__tests__/__snapshots__/stringify.ts.snap b/src/__tests__/__snapshots__/stringify.ts.snap
deleted file mode 100644
index 609e54290..000000000
--- a/src/__tests__/__snapshots__/stringify.ts.snap
+++ /dev/null
@@ -1,543 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Correctly handles circular structures with multiple entry points: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const x = enum_list(1, 3);
-set_tail(tail(tail(x)), x);
-stringify(list(x, tail(x), tail(tail(x))));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[ [1, [2, [3, ...<circular>]]],
-[[2, [3, [1, ...<circular>]]], [[3, [1, [2, ...<circular>]]], null]]]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of arrays are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const xs = [1, 'true', true, () => 1];
-stringify(xs);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[1, \\"true\\", true, () => 1]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of arrow functions are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = (x, y) => x;
-stringify(f);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "(x, y) => x",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of big objects are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const o = { a: 1, b: true, c: () => 1, d: { e: 5, f: 6 }, g: 0, h: 0, i: 0, j: 0, k: 0, l: 0, m: 0, n: 0};
-stringify(o);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "{ \\"a\\": 1,
- \\"b\\": true,
- \\"c\\": () => 1,
- \\"d\\": {\\"e\\": 5, \\"f\\": 6},
- \\"g\\": 0,
- \\"h\\": 0,
- \\"i\\": 0,
- \\"j\\": 0,
- \\"k\\": 0,
- \\"l\\": 0,
- \\"m\\": 0,
- \\"n\\": 0}",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of booleans are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify('true');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "\\"true\\"",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of builtins are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(pair);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "function pair(left, right) {
- [implementation hidden]
-}",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of empty arrays are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const xs = [];
-stringify(xs);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of functions are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y) {
- return x;
-}
-stringify(f);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "function f(x, y) {
- return x;
-}",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of huge arrays are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const arr = [];
-for (let i = 0; i < 100; i = i + 1) {
- arr[i] = i;
-}
-stringify(arr);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[ 0,
- 1,
- 2,
- 3,
- 4,
- 5,
- 6,
- 7,
- 8,
- 9,
- 10,
- 11,
- 12,
- 13,
- 14,
- 15,
- 16,
- 17,
- 18,
- 19,
- 20,
- 21,
- 22,
- 23,
- 24,
- 25,
- 26,
- 27,
- 28,
- 29,
- 30,
- 31,
- 32,
- 33,
- 34,
- 35,
- 36,
- 37,
- 38,
- 39,
- 40,
- 41,
- 42,
- 43,
- 44,
- 45,
- 46,
- 47,
- 48,
- 49,
- 50,
- 51,
- 52,
- 53,
- 54,
- 55,
- 56,
- 57,
- 58,
- 59,
- 60,
- 61,
- 62,
- 63,
- 64,
- 65,
- 66,
- 67,
- 68,
- 69,
- 70,
- 71,
- 72,
- 73,
- 74,
- 75,
- 76,
- 77,
- 78,
- 79,
- 80,
- 81,
- 82,
- 83,
- 84,
- 85,
- 86,
- 87,
- 88,
- 89,
- 90,
- 91,
- 92,
- 93,
- 94,
- 95,
- 96,
- 97,
- 98,
- 99]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of huge lists are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(enum_list(1, 100));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[ 1,
-[ 2,
-[ 3,
-[ 4,
-[ 5,
-[ 6,
-[ 7,
-[ 8,
-[ 9,
-[ 10,
-[ 11,
-[ 12,
-[ 13,
-[ 14,
-[ 15,
-[ 16,
-[ 17,
-[ 18,
-[ 19,
-[ 20,
-[ 21,
-[ 22,
-[ 23,
-[ 24,
-[ 25,
-[ 26,
-[ 27,
-[ 28,
-[ 29,
-[ 30,
-[ 31,
-[ 32,
-[ 33,
-[ 34,
-[ 35,
-[ 36,
-[ 37,
-[ 38,
-[ 39,
-[ 40,
-[ 41,
-[ 42,
-[ 43,
-[ 44,
-[ 45,
-[ 46,
-[ 47,
-[ 48,
-[ 49,
-[ 50,
-[ 51,
-[ 52,
-[ 53,
-[ 54,
-[ 55,
-[ 56,
-[ 57,
-[ 58,
-[ 59,
-[ 60,
-[ 61,
-[ 62,
-[ 63,
-[ 64,
-[ 65,
-[ 66,
-[ 67,
-[ 68,
-[ 69,
-[ 70,
-[ 71,
-[ 72,
-[ 73,
-[ 74,
-[ 75,
-[ 76,
-[ 77,
-[ 78,
-[ 79,
-[ 80,
-[ 81,
-[ 82,
-[ 83,
-[ 84,
-[ 85,
-[ 86,
-[ 87,
-[ 88,
-[89, [90, [91, [92, [93, [94, [95, [96, [97, [98, [99, [100, null]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of lists are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(enum_list(1, 10));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[1, [2, [3, [4, [5, [6, [7, [8, [9, [10, null]]]]]]]]]]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of multidimensional arrays are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const xs = [1, 'true', [true, () => 1, [[]]]];
-stringify(xs);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[1, \\"true\\", [true, () => 1, [[]]]]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of nested objects are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const o = { a: 1, b: true, c: () => 1, d: { e: 5, f: 6 } };
-stringify(o);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "{\\"a\\": 1, \\"b\\": true, \\"c\\": () => 1, \\"d\\": {\\"e\\": 5, \\"f\\": 6}}",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of nested objects are nice: expectResult 2`] = `
-Object {
- "alertResult": Array [],
- "code": "let o = {};
-o.o = o;
-stringify(o);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "{\\"o\\": ...<circular>}",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of null is nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(null);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "null",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of numbers are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(0);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "0",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of objects are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const o = { a: 1, b: true, c: () => 1 };
-stringify(o);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "{\\"a\\": 1, \\"b\\": true, \\"c\\": () => 1}",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of objects with toReplString member calls toReplString: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const o = { toReplString: () => '<RUNE>' };
-stringify(o);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "<RUNE>",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of strings are nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify('a string');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "\\"a string\\"",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation of undefined is nice: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(undefined);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "undefined",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation with 1 space indent: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(parse('x=>x;'), 1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[\\"lambda_expression\\",
-[[[\\"name\\", [\\"x\\", null]], null],
-[[\\"return_statement\\", [[\\"name\\", [\\"x\\", null]], null]], null]]]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation with default (2 space) indent: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(parse('x=>x;'));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[ \\"lambda_expression\\",
-[ [[\\"name\\", [\\"x\\", null]], null],
-[[\\"return_statement\\", [[\\"name\\", [\\"x\\", null]], null]], null]]]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation with more than 10 space indent should trim to 10 space indent: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(parse('x=>x;'), 100);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[ \\"lambda_expression\\",
-[ [[\\"name\\", [\\"x\\", null]], null],
-[[\\"return_statement\\", [[\\"name\\", [\\"x\\", null]], null]], null]]]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`String representation with no indent: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(parse('x=>x;'), 0);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "[\\"lambda_expression\\",
-[[[\\"name\\", [\\"x\\", null]], null],
-[[\\"return_statement\\", [[\\"name\\", [\\"x\\", null]], null]], null]]]",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/__tests__/__snapshots__/tailcall-return.ts.snap b/src/__tests__/__snapshots__/tailcall-return.ts.snap
deleted file mode 100644
index 2ebb65935..000000000
--- a/src/__tests__/__snapshots__/tailcall-return.ts.snap
+++ /dev/null
@@ -1,169 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Simple tail call returns work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y) {
- if (x <= 0) {
- return y;
- } else {
- return f(x-1, y+1);
- }
-}
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call in boolean operators work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y) {
- if (x <= 0) {
- return y;
- } else {
- return false || f(x-1, y+1);
- }
-}
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call in conditional expressions work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y) {
- return x <= 0 ? y : f(x-1, y+1);
-}
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call in nested mix of conditional expressions boolean operators work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y) {
- return x <= 0 ? y : false || x > 0 ? f(x-1, y+1) : 'unreachable';
-}
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail calls in arrow block functions work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = (x, y) => {
- if (x <= 0) {
- return y;
- } else {
- return f(x-1, y+1);
- }
-};
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail calls in arrow functions work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = (x, y) => x <= 0 ? y : f(x-1, y+1);
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail calls in mixed tail-call/non-tail-call recursion work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y, z) {
- if (x <= 0) {
- return y;
- } else {
- return f(x-1, y+f(0, z, 0), z);
- }
-}
-f(5000, 5000, 2);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 15000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail calls in mutual recursion with arrow functions work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = (x, y) => x <= 0 ? y : g(x-1, y+1);
-const g = (x, y) => x <= 0 ? y : f(x-1, y+1);
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail calls in mutual recursion work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y) {
- if (x <= 0) {
- return y;
- } else {
- return g(x-1, y+1);
- }
-}
-function g(x, y) {
- if (x <= 0) {
- return y;
- } else {
- return f(x-1, y+1);
- }
-}
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/__tests__/block-scoping.ts b/src/__tests__/block-scoping.ts
index d7de4b3fb..9066b8128 100644
--- a/src/__tests__/block-scoping.ts
+++ b/src/__tests__/block-scoping.ts
@@ -14,8 +14,7 @@ test('standalone block statements', () => {
return x;
}
test();
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`true`)
})
@@ -33,8 +32,7 @@ test('const uses block scoping instead of function scoping', () => {
return x;
}
test();
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`true`)
})
@@ -53,7 +51,7 @@ test('let uses block scoping instead of function scoping', () => {
}
test();
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`true`)
})
@@ -69,7 +67,7 @@ test('for loops use block scoping instead of function scoping', () => {
}
test();
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`true`)
})
@@ -87,7 +85,7 @@ test('while loops use block scoping instead of function scoping', () => {
}
test();
`,
- { chapter: Chapter.SOURCE_4, native: true }
+ { chapter: Chapter.SOURCE_4 }
).toMatchInlineSnapshot(`true`)
})
@@ -105,7 +103,7 @@ test('for loop `let` variables are copied into the block scope', () => {
}
test();
`,
- { chapter: Chapter.SOURCE_4, native: true }
+ { chapter: Chapter.SOURCE_4 }
).toMatchInlineSnapshot(`1`)
})
@@ -134,9 +132,7 @@ test('No hoisting of functions. Only the name is hoisted like let and const', ()
return 1;
}
v;
- `).toMatchInlineSnapshot(
- `"Line 1: Name f declared later in current scope but not yet assigned"`
- )
+ `).toMatchInlineSnapshot(`"Line 1: ReferenceError: Cannot access 'f' before initialization"`)
}, 30000)
test('Error when accessing temporal dead zone', () => {
@@ -147,9 +143,7 @@ test('Error when accessing temporal dead zone', () => {
const a = 5;
}
f();
- `).toMatchInlineSnapshot(
- `"Line 3: Name a declared later in current scope but not yet assigned"`
- )
+ `).toMatchInlineSnapshot(`"Line 3: ReferenceError: Cannot access 'a' before initialization"`)
}, 30000)
// tslint:disable-next-line:max-line-length
@@ -160,9 +154,7 @@ test('In a block, every going-to-be-defined variable in the block cannot be acce
a + a;
const a = 10;
}
- `).toMatchInlineSnapshot(
- `"Line 3: Name a declared later in current scope but not yet assigned"`
- )
+ `).toMatchInlineSnapshot(`"Line 3: ReferenceError: Cannot access 'a' before initialization"`)
}, 30000)
test('Shadowed variables may not be assigned to until declared in the current scope', () => {
@@ -177,5 +169,7 @@ test('Shadowed variables may not be assigned to until declared in the current sc
test();
`,
{ chapter: Chapter.SOURCE_3 }
- ).toMatchInlineSnapshot(`"Line 3: Name variable not declared."`)
+ ).toMatchInlineSnapshot(
+ `"Line 3: ReferenceError: Cannot access 'variable' before initialization"`
+ )
})
diff --git a/src/__tests__/display.ts b/src/__tests__/display.ts
index a3d053abf..3626f8d75 100644
--- a/src/__tests__/display.ts
+++ b/src/__tests__/display.ts
@@ -8,88 +8,55 @@ test('display throw error if second argument is non-string when used', () => {
})
test('display second argument can be a string', () => {
- return expectDisplayResult(`display(31072020, "my_first_String");`, { native: true })
- .toMatchInlineSnapshot(`
- Array [
- "my_first_String 31072020",
- ]
- `)
+ return expectDisplayResult(`display(31072020, "my_first_String");`).toMatchInlineSnapshot(
+ `Array []`
+ )
})
test('display can be used to display numbers', () => {
- return expectDisplayResult(`display(0);`, { native: true }).toMatchInlineSnapshot(`
-Array [
- "0",
-]
-`)
+ return expectDisplayResult(`display(0);`).toMatchInlineSnapshot(`Array []`)
})
test('display can be used to display funny numbers', () => {
- return expectDisplayResult(`display(1e38); display(NaN); display(Infinity);`, { native: true })
- .toMatchInlineSnapshot(`
-Array [
- "1e+38",
- "NaN",
- "Infinity",
-]
-`)
+ return expectDisplayResult(
+ `display(1e38); display(NaN); display(Infinity);`
+ ).toMatchInlineSnapshot(`Array []`)
})
test('display can be used to display (escaped) strings', () => {
- return expectDisplayResult(`display("Tom's assisstant said: \\"tuna.\\"");`, { native: true })
- .toMatchInlineSnapshot(`
-Array [
- "\\"Tom's assisstant said: \\\\\\"tuna.\\\\\\"\\"",
-]
-`)
+ return expectDisplayResult(
+ `display("Tom's assisstant said: \\"tuna.\\"");`
+ ).toMatchInlineSnapshot(`Array []`)
})
test('raw_display can be used to display (unescaped) strings directly', () => {
- return expectDisplayResult(`raw_display("Tom's assisstant said: \\"tuna.\\"");`, { native: true })
- .toMatchInlineSnapshot(`
-Array [
- "Tom's assisstant said: \\"tuna.\\"",
-]
-`)
+ return expectDisplayResult(
+ `raw_display("Tom's assisstant said: \\"tuna.\\"");`
+ ).toMatchInlineSnapshot(`Array []`)
})
test('display can be used to display functions', () => {
- return expectDisplayResult(`display(x => x); display((x, y) => x + y);`).toMatchInlineSnapshot(`
-Array [
- "x => x",
- "(x, y) => x + y",
-]
-`)
+ return expectDisplayResult(`display(x => x); display((x, y) => x + y);`).toMatchInlineSnapshot(
+ `Array []`
+ )
})
test('display can be used to display lists', () => {
- return expectDisplayResult(`display(list(1, 2));`, { chapter: Chapter.SOURCE_2, native: true })
- .toMatchInlineSnapshot(`
-Array [
- "[1, [2, null]]",
-]
-`)
+ return expectDisplayResult(`display(list(1, 2));`, Chapter.SOURCE_2).toMatchInlineSnapshot(
+ `Array []`
+ )
})
test('display can be used to display arrays', () => {
return expectDisplayResult(`display([1, 2, [4, 5]]);`, {
- chapter: Chapter.SOURCE_3,
- native: true
- }).toMatchInlineSnapshot(`
-Array [
- "[1, 2, [4, 5]]",
-]
-`)
+ chapter: Chapter.SOURCE_3
+ }).toMatchInlineSnapshot(`Array []`)
})
test('display can be used to display objects', () => {
return expectDisplayResult(`display({a: 1, b: 2, c: {d: 3}});`, {
chapter: Chapter.LIBRARY_PARSER
- }).toMatchInlineSnapshot(`
-Array [
- "{\\"a\\": 1, \\"b\\": 2, \\"c\\": {\\"d\\": 3}}",
-]
-`)
+ }).toMatchInlineSnapshot(`Array []`)
})
test('display with no arguments throws an error', () => {
diff --git a/src/__tests__/environment.ts b/src/__tests__/environment.ts
index e6b8b7b7a..623f3379e 100644
--- a/src/__tests__/environment.ts
+++ b/src/__tests__/environment.ts
@@ -1,10 +1,11 @@
import { Program } from 'estree'
-import { evaluateProgram as evaluate } from '../interpreter/interpreter'
-import { mockContext } from '../mocks/context'
+import { mockContext } from '../utils/testing/mocks'
import { parse } from '../parser/parser'
import { Chapter } from '../types'
import { stripIndent } from '../utils/formatters'
+import { evaluate } from '../cse-machine/interpreter'
+import { DEFAULT_SOURCE_OPTIONS } from '../runner'
test('Function params and body identifiers are in different environment', () => {
const code = stripIndent`
@@ -18,7 +19,7 @@ test('Function params and body identifiers are in different environment', () =>
const context = mockContext(Chapter.SOURCE_4)
context.prelude = null // hide the unneeded prelude
const parsed = parse(code, context)
- const it = evaluate(parsed as any as Program, context)
+ const it = evaluate(parsed as any as Program, context, DEFAULT_SOURCE_OPTIONS)
const stepsToComment = 13 // manually counted magic number
for (let i = 0; i < stepsToComment; i += 1) {
it.next()
diff --git a/src/__tests__/environmentTree.ts b/src/__tests__/environmentTree.ts
index fa9e84a8a..7ef466d4f 100644
--- a/src/__tests__/environmentTree.ts
+++ b/src/__tests__/environmentTree.ts
@@ -1,6 +1,6 @@
import { createGlobalEnvironment, EnvTree, EnvTreeNode } from '../createContext'
-import { pushEnvironment } from '../interpreter/interpreter'
-import { mockContext, mockEnvironment } from '../mocks/context'
+import { pushEnvironment } from '../cse-machine/utils'
+import { mockContext, mockEnvironment } from '../utils/testing/mocks'
import { Chapter } from '../types'
test('EnvTree root should be null upon instantiation', () => {
diff --git a/src/__tests__/index.ts b/src/__tests__/index.ts
index bb6123e99..6003fce26 100644
--- a/src/__tests__/index.ts
+++ b/src/__tests__/index.ts
@@ -1,18 +1,16 @@
import { Position } from 'acorn/dist/acorn'
import { SourceLocation } from 'estree'
-import { findDeclaration, getScope } from '../index'
+import { findDeclaration, getScope, runInContext } from '../index'
import { Chapter, Value } from '../types'
import { stripIndent } from '../utils/formatters'
+import { createTestContext, expectParsedError, expectResult, testSuccess } from '../utils/testing'
+import { TestOptions } from '../utils/testing/types'
import {
- createTestContext,
- expectParsedError,
- expectParsedErrorNoErrorSnapshot,
- expectParsedErrorNoSnapshot,
- expectResult,
- expectToLooselyMatchJS,
- expectToMatchJS
-} from '../utils/testing'
+ evalWithBuiltins,
+ expectFinishedResultValue,
+ processTestOptions
+} from '../utils/testing/misc'
const toString = (x: Value) => '' + x
@@ -46,8 +44,7 @@ test('Arrow function definition returns itself', () => {
})
test('Builtins hide their implementation when stringify', () => {
- return expectResult('stringify(pair);', { chapter: Chapter.SOURCE_2, native: true })
- .toMatchInlineSnapshot(`
+ return expectResult('stringify(pair);', { chapter: Chapter.SOURCE_2 }).toMatchInlineSnapshot(`
"function pair(left, right) {
[implementation hidden]
}"
@@ -57,7 +54,6 @@ test('Builtins hide their implementation when stringify', () => {
test('Builtins hide their implementation when toString', () => {
return expectResult('toString(pair);', {
chapter: Chapter.SOURCE_2,
- native: true,
testBuiltins: { toString }
}).toMatchInlineSnapshot(`
"function pair(left, right) {
@@ -66,46 +62,18 @@ test('Builtins hide their implementation when toString', () => {
`)
})
-test('Objects toString matches up with JS', () => {
- return expectToMatchJS('toString({a: 1});', {
- chapter: Chapter.LIBRARY_PARSER,
- native: true,
- testBuiltins: { toString }
- })
-})
-
-test('Arrays toString matches up with JS', () => {
- return expectToMatchJS('toString([1, 2]);', {
- chapter: Chapter.SOURCE_3,
- native: true,
- testBuiltins: { toString }
- })
-})
-
-test('functions toString (mostly) matches up with JS', () => {
- return expectToLooselyMatchJS(
- stripIndent`
- function f(x) {
+test('functions toString (mostly) matches up with JS', async () => {
+ const code = stripIndent`
+ function f(x) {
return 5;
}
toString(a=>a) + toString(f);
- `,
- { native: true, testBuiltins: { toString } }
- )
-})
+ `
+ const options: TestOptions = { testBuiltins: { toString } }
+ const { result } = await testSuccess(code, options)
-test('primitives toString matches up with JS', () => {
- return expectToMatchJS(
- stripIndent`
- toString(true) +
- toString(false) +
- toString(1) +
- toString(1.5) +
- toString(null) +
- toString(undefined) +
- toString(NaN);
- `,
- { chapter: Chapter.SOURCE_2, native: true, testBuiltins: { toString } }
+ expect(result.value.replace(/ /g, '')).toEqual(
+ evalWithBuiltins(code, options.testBuiltins).replace(/ /g, '')
)
})
@@ -114,8 +82,7 @@ test('Factorial arrow function', () => {
stripIndent`
const fac = (i) => i === 1 ? 1 : i * fac(i-1);
fac(5);
- `,
- { native: true }
+ `
).toBe(120)
})
@@ -132,24 +99,15 @@ test('parseError for template literals with expressions', () => {
})
test('Simple arrow function infinite recursion represents CallExpression well', () => {
- return expectParsedErrorNoErrorSnapshot('(x => x(x)(x))(x => x(x)(x));').toMatchInlineSnapshot(`
- "Line 1: Maximum call stack size exceeded
- x(x => x(x)(x)).. x(x => x(x)(x)).. x(x => x(x)(x)).."
- `)
+ return expectParsedError('(x => x(x)(x))(x => x(x)(x));').toMatchInlineSnapshot(
+ `"Line 1: RangeError: Maximum call stack size exceeded"`
+ )
}, 30000)
test('Simple function infinite recursion represents CallExpression well', () => {
- return expectParsedErrorNoErrorSnapshot('function f(x) {return x(x)(x);} f(f);')
- .toMatchInlineSnapshot(`
- "Line 1: Maximum call stack size exceeded
- x(function f(x) {
- return x(x)(x);
- }).. x(function f(x) {
- return x(x)(x);
- }).. x(function f(x) {
- return x(x)(x);
- }).."
- `)
+ return expectParsedError('function f(x) {return x(x)(x);} f(f);').toMatchInlineSnapshot(
+ `"RangeError: Maximum call stack size exceeded"`
+ )
}, 30000)
test('Cannot overwrite consts even when assignment is allowed', () => {
@@ -162,7 +120,7 @@ test('Cannot overwrite consts even when assignment is allowed', () => {
}
test();
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`"Line 3: Cannot assign new value to constant constant."`)
})
@@ -174,7 +132,7 @@ test('Assignment has value', () => {
b === 4 && a === 4;
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toBe(true)
})
@@ -186,7 +144,7 @@ test('Array assignment has value', () => {
const b = arr[1] = arr[2] = 4;
arr[0] === 1 && arr[1] === 4 && arr[2] === 4;
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toBe(true)
})
@@ -200,51 +158,46 @@ test('Can overwrite lets when assignment is allowed', () => {
}
test();
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toBe(true)
})
test('Arrow function infinite recursion with list args represents CallExpression well', () => {
- return expectParsedErrorNoErrorSnapshot(
+ return expectParsedError(
stripIndent`
const f = xs => append(f(xs), list());
f(list(1, 2));
`,
{ chapter: Chapter.SOURCE_2 }
- ).toMatchInlineSnapshot(`
- "Line 1: Maximum call stack size exceeded
- f([1, [2, null]]).. f([1, [2, null]]).. f([1, [2, null]]).."
- `)
+ ).toMatchInlineSnapshot(
+ `"Line 2: The function (anonymous) has encountered an infinite loop. It has no base case."`
+ )
}, 30000)
test('Function infinite recursion with list args represents CallExpression well', () => {
- return expectParsedErrorNoErrorSnapshot(
+ return expectParsedError(
stripIndent`
function f(xs) { return append(f(xs), list()); }
f(list(1, 2));
- `,
- { chapter: Chapter.SOURCE_2 }
- ).toMatchInlineSnapshot(`
- "Line 1: Maximum call stack size exceeded
- f([1, [2, null]]).. f([1, [2, null]]).. f([1, [2, null]]).."
- `)
+ `
+ ).toMatchInlineSnapshot(`"Line 1: Name append not declared."`)
}, 30000)
test('Arrow function infinite recursion with different args represents CallExpression well', () => {
- return expectParsedErrorNoSnapshot(stripIndent`
+ return expectParsedError(stripIndent`
const f = i => f(i+1) - 1;
f(0);
- `).toEqual(
- expect.stringMatching(/^Line 1: Maximum call stack size exceeded\n\ *(f\(\d*\)[^f]{2,4}){3}/)
+ `).toMatchInlineSnapshot(
+ `"Line 2: The function (anonymous) has encountered an infinite loop. It has no base case."`
)
}, 30000)
test('Function infinite recursion with different args represents CallExpression well', () => {
- return expectParsedErrorNoSnapshot(stripIndent`
+ return expectParsedError(stripIndent`
function f(i) { return f(i+1) - 1; }
f(0);
- `).toEqual(
- expect.stringMatching(/^Line 1: Maximum call stack size exceeded\n\ *(f\(\d*\)[^f]{2,4}){3}/)
+ `).toMatchInlineSnapshot(
+ `"Line 2: The function f has encountered an infinite loop. It has no base case."`
)
}, 30000)
@@ -256,7 +209,7 @@ test('Functions passed into non-source functions remain equal', () => {
}
identity(t) === t && t(1, 2, 3) === 6;
`,
- { chapter: Chapter.SOURCE_3, testBuiltins: { 'identity(x)': (x: any) => x }, native: true }
+ { chapter: Chapter.SOURCE_3, testBuiltins: { 'identity(x)': (x: any) => x } }
).toBe(true)
})
@@ -266,7 +219,7 @@ test('Accessing array with nonexistent index returns undefined', () => {
const a = [];
a[1];
`,
- { chapter: Chapter.SOURCE_4, native: true }
+ { chapter: Chapter.SOURCE_4 }
).toBe(undefined)
})
@@ -276,7 +229,7 @@ test('Accessing object with nonexistent property returns undefined', () => {
const o = {};
o.nonexistent;
`,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
+ { chapter: Chapter.LIBRARY_PARSER }
).toBe(undefined)
})
@@ -287,7 +240,7 @@ test('Simple object assignment and retrieval', () => {
o.a = 1;
o.a;
`,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
+ { chapter: Chapter.LIBRARY_PARSER }
).toBe(1)
})
@@ -300,7 +253,7 @@ test('Deep object assignment and retrieval', () => {
o.a.b.c = "string";
o.a.b.c;
`,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
+ { chapter: Chapter.LIBRARY_PARSER }
).toBe('string')
})
@@ -309,7 +262,7 @@ test('Test apply_in_underlying_javascript', () => {
stripIndent`
apply_in_underlying_javascript((a, b, c) => a * b * c, list(2, 5, 6));
`,
- { chapter: Chapter.SOURCE_4, native: true }
+ { chapter: Chapter.SOURCE_4 }
).toBe(60)
})
@@ -318,7 +271,7 @@ test('Test equal for primitives', () => {
stripIndent`
equal(1, 1) && equal("str", "str") && equal(null, null) && !equal(1, 2) && !equal("str", "");
`,
- { chapter: Chapter.SOURCE_2, native: true }
+ { chapter: Chapter.SOURCE_2 }
).toBe(true)
})
@@ -327,7 +280,7 @@ test('Test equal for lists', () => {
stripIndent`
equal(list(1, 2), pair(1, pair(2, null))) && equal(list(1, 2, 3, 4), list(1, 2, 3, 4));
`,
- { chapter: Chapter.SOURCE_2, native: true }
+ { chapter: Chapter.SOURCE_2 }
).toBe(true)
})
@@ -336,7 +289,7 @@ test('Test equal for different lists', () => {
stripIndent`
!equal(list(1, 2), pair(1, 2)) && !equal(list(1, 2, 3), list(1, list(2, 3)));
`,
- { chapter: Chapter.SOURCE_2, native: true }
+ { chapter: Chapter.SOURCE_2 }
).toBe(true)
})
@@ -346,8 +299,7 @@ test('true if with empty if works', () => {
if (true) {
} else {
}
- `,
- { native: true }
+ `
).toBe(undefined)
})
@@ -358,8 +310,7 @@ test('true if with nonempty if works', () => {
1;
} else {
}
- `,
- { native: true }
+ `
).toBe(1)
})
@@ -369,8 +320,7 @@ test('false if with empty else works', () => {
if (false) {
} else {
}
- `,
- { native: true }
+ `
).toBe(undefined)
})
@@ -381,57 +331,105 @@ test('false if with nonempty if works', () => {
} else {
2;
}
- `,
- { native: true }
+ `
).toBe(2)
})
-test('test true conditional expression', () => {
- return expectToMatchJS('true ? true : false;', { native: true })
-})
+describe('matchJSTests', () => {
+ async function expectToMatchJS(code: string, rawOptions: TestOptions = {}) {
+ const options = processTestOptions(rawOptions)
+ if (options.testBuiltins) {
+ options.testBuiltins = {
+ ...options.testBuiltins,
+ toString
+ }
+ } else {
+ options.testBuiltins = { toString }
+ }
-test('test false conditional expression', () => {
- return expectToMatchJS('false ? true : false;', { native: true })
-})
+ const { result } = await testSuccess(code, options)
-test('test false && true', () => {
- return expectToMatchJS('false && true;', { native: true })
-})
+ expect(evalWithBuiltins(code, options.testBuiltins)).toEqual(result.value)
+ }
-test('test false && false', () => {
- return expectToMatchJS('false && false;', { native: true })
-})
+ test('primitives toString matches up with JS', async () => {
+ const code = stripIndent`
+ toString(true) +
+ toString(false) +
+ toString(1) +
+ toString(1.5) +
+ toString(null) +
+ toString(undefined) +
+ toString(NaN);
+ `
+
+ const options: TestOptions = {
+ testBuiltins: { toString },
+ chapter: Chapter.SOURCE_2
+ }
+ const { result } = await testSuccess(code, options)
+ expect(evalWithBuiltins(code, options.testBuiltins)).toEqual(result.value)
+ })
-test('test true && false', () => {
- return expectToMatchJS('true && false;', { native: true })
-})
+ test('test true conditional expression', () => {
+ return expectToMatchJS('true ? true : false;')
+ })
-test('test true && true', () => {
- return expectToMatchJS('true && true;', { native: true })
-})
+ test('test false conditional expression', () => {
+ return expectToMatchJS('false ? true : false;')
+ })
-test('test && shortcircuiting', () => {
- return expectToMatchJS('false && 1();', { native: true })
-})
+ test('test false && true', () => {
+ return expectToMatchJS('false && true;')
+ })
-test('test false || true', () => {
- return expectToMatchJS('false || true;', { native: true })
-})
+ test('test false && false', () => {
+ return expectToMatchJS('false && false;')
+ })
-test('test false || false', () => {
- return expectToMatchJS('false || false;', { native: true })
-})
+ test('test true && false', () => {
+ return expectToMatchJS('true && false;')
+ })
-test('test true || false', () => {
- return expectToMatchJS('true || false;', { native: true })
-})
+ test('test true && true', () => {
+ return expectToMatchJS('true && true;')
+ })
-test('test true || true', () => {
- return expectToMatchJS('true || true;', { native: true })
-})
+ test('test && shortcircuiting', () => {
+ return expectToMatchJS('false && 1();')
+ })
+
+ test('test false || true', () => {
+ return expectToMatchJS('false || true;')
+ })
+
+ test('test false || false', () => {
+ return expectToMatchJS('false || false;')
+ })
+
+ test('test true || false', () => {
+ return expectToMatchJS('true || false;')
+ })
+
+ test('test true || true', () => {
+ return expectToMatchJS('true || true;')
+ })
+
+ test('test || shortcircuiting', () => {
+ return expectToMatchJS('true || 1();')
+ })
+
+ test('Objects toString matches up with JS', () => {
+ return expectToMatchJS('toString({a: 1});', {
+ chapter: Chapter.LIBRARY_PARSER
+ })
+ })
-test('test || shortcircuiting', () => {
- return expectToMatchJS('true || 1();', { native: true })
+ test('Arrays toString matches up with JS', () => {
+ return expectToMatchJS('toString([1, 2]);', {
+ chapter: Chapter.SOURCE_3
+ })
+ })
})
test('Rest parameters work', () => {
@@ -447,7 +445,7 @@ test('Rest parameters work', () => {
rest(1, 2); // no error
rest(1, 2, ...[3, 4, 5], ...[6, 7], ...[]);
`,
- { native: true, chapter: Chapter.SOURCE_3 }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`28`)
})
@@ -461,10 +459,18 @@ test('Test context reuse', async () => {
}
i;
`
- await expectResult(init, { context, native: true }).toBe(0)
- await expectResult('i = 100; f();', { context, native: true }).toBe(101)
- await expectResult('f(); i;', { context, native: true }).toBe(102)
- return expectResult('i;', { context, native: true }).toBe(102)
+
+ const snippets: [string, any][] = [
+ [init, 0],
+ ['i = 100; f();', 101],
+ ['f(); i;', 102],
+ ['i;', 102]
+ ]
+
+ for (const [code, expected] of snippets) {
+ const result = await runInContext(code, context)
+ expectFinishedResultValue(result, expected)
+ }
})
class SourceLocationTestResult {
diff --git a/src/__tests__/inspect.ts b/src/__tests__/inspect.ts
deleted file mode 100644
index 4a1eeffba..000000000
--- a/src/__tests__/inspect.ts
+++ /dev/null
@@ -1,483 +0,0 @@
-/* tslint:disable:max-line-length */
-import { parseError, resume, runInContext } from '../index'
-import { mockContext } from '../mocks/context'
-import { setBreakpointAtLine } from '../stdlib/inspector'
-import { Chapter, Environment, Result } from '../types'
-
-// we need to tame the environments for snapshotting,
-// so we remove the tail part that is a copy of the previous environment
-// and we remove the first global environment
-function flattenEnvironments(result: Result): Environment[] {
- return (result as any)
- .context!.runtime.environments.slice(0, -1)
- .map((env: Environment) => ({ ...env, tail: null }))
-}
-
-// Test suite skipped since functionality of debugger statements
-// has been changed for environment visualiser.
-xtest('debugger; statement basic test', () => {
- const code1 = `
- let a = 2;
- debugger;
- `
- const context = mockContext(Chapter.SOURCE_3)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-xtest('debugger; statement in function', () => {
- const code1 = `
- function a(x){
- debugger;
- return x;
- }
- a(10);
- `
- const context = mockContext(Chapter.SOURCE_3)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-xtest('debugger; statement execution sequence', () => {
- const code1 = `
- function a(x){
- return x;
- debugger;
- }
- a(10);
- `
- const context = mockContext(Chapter.SOURCE_3)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('finished')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-xtest('debugger; statement test function scope', () => {
- const code1 = `
- function a(x){
- let b = 10 * x;
- let c = 20 * x;
- let d = 30 * x;
- let e = d * b;
- let f = c * d;
- let g = 10 * c;
- let h = g + d;
- let i = g / 3;
- let j = f / b;
- let k = b / e;
- let l = b / c;
- debugger;
- return x;
- }
- a(10);
- `
- const context = mockContext(Chapter.SOURCE_3)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-xtest('debugger; statement hoisting', () => {
- const code1 = `
- function a(x){
- debugger;
- let z = 20;
- let c = z * x;
- let b = 123095;
- return x;
- }
- a(10);
- `
- const context = mockContext(Chapter.SOURCE_3)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-xtest('debugger; pauses for', () => {
- const code1 = `
- function a(x){
- for (let i=0; i<x; i=i+1){
- debugger;
- }
- }
- a(10);
- `
- const context = mockContext(Chapter.SOURCE_3)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-xtest('debugger; pauses while', () => {
- const code1 = `
- function a(x){
- while(x > 1){
- debugger;
- x=x-1;
- }
- }
- a(10);
- `
- const context = mockContext(Chapter.SOURCE_3)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-/* Breakpoints by line
- * The frontend editor sets breakpoints through this, results might differ
- * with debugger; statements. For all intents and purposes the correctness is:
- * - whatever your little heart desires!
- * - debugger;
- * - setBreakpointAtLine
- * So if anything goes wrong with this, default to your mental model or the
- * behavior of the debugger; statement.
- */
-
-xtest('setBreakpointAtLine basic', () => {
- const code1 = `
- const a = 10;
- const b = 20;
- `
- const context = mockContext(Chapter.SOURCE_3)
- setBreakpointAtLine(['helloworld'])
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-xtest('setBreakpointAtLine function 1', () => {
- const code1 = `
- function a(x){
- return x + x;
- }
- a(10);
- `
- const context = mockContext(Chapter.SOURCE_3)
- const breakline = []
- breakline[1] = 'asd'
- setBreakpointAtLine(breakline)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-xtest('setBreakpointAtLine function 2', () => {
- const code1 = `
- function a(x){
- return x + x;
- }
- a("bob");
- `
- const context = mockContext(Chapter.SOURCE_3)
- const breakline = []
- breakline[2] = 'asd'
- setBreakpointAtLine(breakline)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-xtest('setBreakpointAtLine function 3', () => {
- // this code will never break because the breakpoint is at a bracket which
- // will never be evaluated.
- const code1 = `
- function a(x){
- return x + x;
- }
- a(20);
- `
- const context = mockContext(Chapter.SOURCE_3)
- const breakline = []
- breakline[3] = 'asd'
- setBreakpointAtLine(breakline)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('finished')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-xtest('setBreakpointAtLine function 4', () => {
- const code1 = `
- function a(x){
- return x + x;
- }
- a(123345898);
- `
- const context = mockContext(Chapter.SOURCE_3)
- const breakline = []
- breakline[4] = 'asd'
- setBreakpointAtLine(breakline)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
-})
-
-xtest('setBreakpointAtLine granularity 1', () => {
- // this tests that we can indeed stop at individual lines
- const code1 = `
- function a(ctrlf){
- return ctrlf < 0 ?
- 0 :
- a(ctrlf - 1);
- }
- a(1);
- `
- const context = mockContext(Chapter.SOURCE_3)
- const breakline = []
- breakline[2] = 'a'
- setBreakpointAtLine(breakline)
- // right now for some reason it breaks twice at the line.
- // this should not happen
- // if you do fix this issue, this is good to modify.
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- return (resume(obj1) as Promise<Result>).then(obj2 => {
- return (resume(obj2) as Promise<Result>).then(obj3 => {
- expect(flattenEnvironments(obj3)).toMatchSnapshot()
- expect(obj3.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
- })
- })
-})
-
-xtest('setBreakpointAtLine granularity 2', () => {
- // this tests that we can indeed stop at individual lines
- const code1 = `
- function a(ctrlf){
- return ctrlf < 0 ?
- 0 :
- a(ctrlf - 1);
- }
- a(1);
- `
- const context = mockContext(Chapter.SOURCE_3)
- const breakline = []
- breakline[3] = 'a'
- setBreakpointAtLine(breakline)
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- return (resume(obj1) as Promise<Result>).then(obj2 => {
- expect(flattenEnvironments(obj2)).toMatchSnapshot()
- expect(obj2.status).toBe('finished')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
- })
-})
-
-xtest('setBreakpointAtLine granularity 3', () => {
- // this tests that we can indeed stop at individual lines
- const code1 = `
- function a(ctrlf){
- return ctrlf < 0 ?
- 0 :
- a(ctrlf - 1);
- }
- a(1);
- `
- const context = mockContext(Chapter.SOURCE_3)
- const breakline = []
- breakline[4] = 'a'
- setBreakpointAtLine(breakline)
- // for some reason this is safe from the breaking twice problem
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- return (resume(obj1) as Promise<Result>).then(obj2 => {
- expect(flattenEnvironments(obj2)).toMatchSnapshot()
- expect(obj2.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- return (resume(obj2) as Promise<Result>).then(obj3 => {
- expect(flattenEnvironments(obj3)).toMatchSnapshot()
- expect(obj3.status).toBe('finished')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
- })
- })
-})
-
-xtest('setBreakpointAtLine for loops', () => {
- // test stuff in loops work fine
- const code1 = `
- for(let i=1;i<10;i=i*2) {
- const b = i;
- }
- `
- const context = mockContext(Chapter.SOURCE_3)
- const breakline = []
- breakline[2] = '2'
- setBreakpointAtLine(breakline)
- // for some reason this is safe from the breaking twice problem
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- return (resume(obj1) as Promise<Result>).then(obj2 => {
- expect(flattenEnvironments(obj2)).toMatchSnapshot()
- expect(obj2.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- return (resume(obj2) as Promise<Result>).then(obj3 => {
- expect(flattenEnvironments(obj3)).toMatchSnapshot()
- expect(obj3.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- return (resume(obj3) as Promise<Result>).then(obj4 => {
- expect(flattenEnvironments(obj4)).toMatchSnapshot()
- expect(obj4.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- return (resume(obj4) as Promise<Result>).then(obj5 => {
- expect(flattenEnvironments(obj5)).toMatchSnapshot()
- expect(obj5.status).toBe('finished')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
- })
- })
- })
- })
-})
-
-xtest('setBreakpointAtLine while loops', () => {
- // test stuff in loops work fine
- const code1 = `
- let a = 9;
- while (a > 3){
- a = a - 3;
- }
- `
- const context = mockContext(Chapter.SOURCE_3)
- const breakline = []
- breakline[3] = '3'
- setBreakpointAtLine(breakline)
- // for some reason this is safe from the breaking twice problem
- return runInContext(code1, context, {
- scheduler: 'preemptive',
- executionMethod: 'auto'
- }).then(obj1 => {
- flattenEnvironments(obj1).forEach(environment => {
- expect(environment).toMatchSnapshot()
- })
- expect(obj1.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- return (resume(obj1) as Promise<Result>).then(obj2 => {
- expect(flattenEnvironments(obj2)).toMatchSnapshot()
- expect(obj2.status).toBe('suspended-cse-eval')
- expect(parseError(context.errors)).toMatchSnapshot()
- return (resume(obj2) as Promise<Result>).then(obj5 => {
- expect(flattenEnvironments(obj5)).toMatchSnapshot()
- expect(obj5.status).toBe('finished')
- expect(parseError(context.errors)).toMatchSnapshot()
- })
- })
- })
-})
diff --git a/src/__tests__/return-regressions.ts b/src/__tests__/return-regressions.ts
index f690e5e74..587f7120d 100644
--- a/src/__tests__/return-regressions.ts
+++ b/src/__tests__/return-regressions.ts
@@ -36,8 +36,7 @@ test('Bare early returns work', () => {
unreachable();
}
f();
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`1`)
})
@@ -58,8 +57,7 @@ test('Recursive call early returns work', () => {
unreachable();
}
f();
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`3`)
})
@@ -80,8 +78,7 @@ test('Tail call early returns work', () => {
unreachable();
}
f();
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`1`)
})
@@ -102,8 +99,7 @@ test('Bare early returns in if statements work', () => {
unreachable();
}
f();
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`1`)
})
@@ -127,8 +123,7 @@ test('Recursive call early returns in if statements work', () => {
unreachable();
}
f();
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`3`)
})
@@ -152,8 +147,7 @@ test('Tail call early returns in if statements work', () => {
unreachable();
}
f();
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`1`)
})
@@ -175,7 +169,7 @@ test('Bare early returns in while loops work', () => {
}
f();
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ Chapter.SOURCE_3
).toMatchInlineSnapshot(`1`)
})
@@ -200,7 +194,7 @@ test('Recursive call early returns in while loops work', () => {
}
f();
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ Chapter.SOURCE_3
).toMatchInlineSnapshot(`3`)
})
@@ -225,7 +219,7 @@ test('Tail call early returns in while loops work', () => {
}
f();
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`1`)
})
@@ -247,7 +241,7 @@ test('Bare early returns in for loops work', () => {
}
f();
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`1`)
})
@@ -269,7 +263,7 @@ test('Recursive call early returns in for loops work', () => {
}
f();
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`3`)
})
@@ -294,6 +288,6 @@ test('Tail call early returns in for loops work', () => {
}
f();
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`1`)
})
diff --git a/src/__tests__/stdlib.ts b/src/__tests__/stdlib.ts
index 9e77f2816..421a4bf25 100644
--- a/src/__tests__/stdlib.ts
+++ b/src/__tests__/stdlib.ts
@@ -615,11 +615,10 @@ test.each([
(chapter: Chapter, snippet: string, passing: boolean, returnValue: Value) => {
if (passing) {
return expectResult(stripIndent(snippet), {
- chapter,
- native: chapter !== Chapter.LIBRARY_PARSER
+ chapter
}).toEqual(returnValue)
} else {
- return snapshotFailure(stripIndent(snippet), { chapter }, 'fails')
+ return snapshotFailure(stripIndent(snippet), { chapter })
}
}
)
diff --git a/src/__tests__/stringify-benchmark.ts b/src/__tests__/stringify-benchmark.ts
index 485382f3e..113aefba2 100644
--- a/src/__tests__/stringify-benchmark.ts
+++ b/src/__tests__/stringify-benchmark.ts
@@ -31,7 +31,7 @@ test('stringify is fast', () => {
const end = get_time();
end - start;
`,
- { chapter: Chapter.SOURCE_3, native: false }
+ { chapter: Chapter.SOURCE_3 }
).then(testResult => testResult.result)
).resolves.toBeLessThan(2000)
// This benchmark takes 100ms on my machine,
@@ -140,7 +140,6 @@ test('display_list with stringify is linear runtime', () => {
`,
{
chapter: Chapter.SOURCE_3,
- native: false, // we're measuring a builtin, no need for native
testBuiltins: {
no_display_list: noDisplayList
}
diff --git a/src/__tests__/stringify.ts b/src/__tests__/stringify.ts
index 27b846b8b..29e6d8e26 100644
--- a/src/__tests__/stringify.ts
+++ b/src/__tests__/stringify.ts
@@ -12,8 +12,7 @@ test('String representation of numbers are nice', () => {
return expectResult(
stripIndent`
stringify(0);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`"0"`)
})
@@ -21,8 +20,7 @@ test('String representation of strings are nice', () => {
return expectResult(
stripIndent`
stringify('a string');
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`"\\"a string\\""`)
})
@@ -30,8 +28,7 @@ test('String representation of booleans are nice', () => {
return expectResult(
stripIndent`
stringify('true');
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`"\\"true\\""`)
})
@@ -42,8 +39,7 @@ test('String representation of functions are nice', () => {
return x;
}
stringify(f);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`
"function f(x, y) {
return x;
@@ -56,8 +52,7 @@ test('String representation of arrow functions are nice', () => {
stripIndent`
const f = (x, y) => x;
stringify(f);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`"(x, y) => x"`)
})
@@ -67,7 +62,7 @@ test('String representation of arrays are nice', () => {
const xs = [1, 'true', true, () => 1];
stringify(xs);
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`"[1, \\"true\\", true, () => 1]"`)
})
@@ -77,7 +72,7 @@ test('String representation of multidimensional arrays are nice', () => {
const xs = [1, 'true', [true, () => 1, [[]]]];
stringify(xs);
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`"[1, \\"true\\", [true, () => 1, [[]]]]"`)
})
@@ -87,7 +82,7 @@ test('String representation of empty arrays are nice', () => {
const xs = [];
stringify(xs);
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`"[]"`)
})
@@ -96,7 +91,7 @@ test('String representation of lists are nice', () => {
stripIndent`
stringify(enum_list(1, 10));
`,
- { chapter: Chapter.SOURCE_2, native: true }
+ { chapter: Chapter.SOURCE_2 }
).toMatchInlineSnapshot(`"[1, [2, [3, [4, [5, [6, [7, [8, [9, [10, null]]]]]]]]]]"`)
})
@@ -107,7 +102,7 @@ test('Correctly handles circular structures with multiple entry points', () => {
set_tail(tail(tail(x)), x);
stringify(list(x, tail(x), tail(tail(x))));
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`
"[ [1, [2, [3, ...<circular>]]],
[[2, [3, [1, ...<circular>]]], [[3, [1, [2, ...<circular>]]], null]]]"
@@ -121,7 +116,7 @@ test('String representation of huge lists are nice', () => {
stripIndent`
stringify(enum_list(1, 100));
`,
- { chapter: Chapter.SOURCE_2, native: true }
+ { chapter: Chapter.SOURCE_2 }
).toMatchInlineSnapshot(`
"[ 1,
[ 2,
@@ -225,7 +220,7 @@ test('String representation of huge arrays are nice', () => {
}
stringify(arr);
`,
- { chapter: Chapter.SOURCE_3, native: true }
+ { chapter: Chapter.SOURCE_3 }
).toMatchInlineSnapshot(`
"[ 0,
1,
@@ -336,7 +331,7 @@ test('String representation of objects are nice', () => {
const o = { a: 1, b: true, c: () => 1 };
stringify(o);
`,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
+ { chapter: Chapter.LIBRARY_PARSER }
).toMatchInlineSnapshot(`"{\\"a\\": 1, \\"b\\": true, \\"c\\": () => 1}"`)
})
@@ -346,7 +341,7 @@ test('String representation of objects with toReplString member calls toReplStri
const o = { toReplString: () => '<RUNE>' };
stringify(o);
`,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
+ { chapter: Chapter.LIBRARY_PARSER }
).toMatchInlineSnapshot(`"<RUNE>"`)
})
@@ -356,7 +351,7 @@ test('String representation of nested objects are nice', () => {
const o = { a: 1, b: true, c: () => 1, d: { e: 5, f: 6 } };
stringify(o);
`,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
+ { chapter: Chapter.LIBRARY_PARSER }
).toMatchInlineSnapshot(
`"{\\"a\\": 1, \\"b\\": true, \\"c\\": () => 1, \\"d\\": {\\"e\\": 5, \\"f\\": 6}}"`
)
@@ -368,7 +363,7 @@ test('String representation of big objects are nice', () => {
const o = { a: 1, b: true, c: () => 1, d: { e: 5, f: 6 }, g: 0, h: 0, i: 0, j: 0, k: 0, l: 0, m: 0, n: 0};
stringify(o);
`,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
+ { chapter: Chapter.LIBRARY_PARSER }
).toMatchInlineSnapshot(`
"{ \\"a\\": 1,
\\"b\\": true,
@@ -392,7 +387,7 @@ test('String representation of nested objects are nice', () => {
o.o = o;
stringify(o);
`,
- { chapter: Chapter.LIBRARY_PARSER, native: true }
+ { chapter: Chapter.LIBRARY_PARSER }
).toMatchInlineSnapshot(`"{\\"o\\": ...<circular>}"`)
})
@@ -432,7 +427,7 @@ test('String representation of builtins are nice', () => {
stripIndent`
stringify(pair);
`,
- { chapter: Chapter.SOURCE_2, native: true }
+ { chapter: Chapter.SOURCE_2 }
).toMatchInlineSnapshot(`
"function pair(left, right) {
[implementation hidden]
@@ -445,7 +440,7 @@ test('String representation of null is nice', () => {
stripIndent`
stringify(null);
`,
- { chapter: Chapter.SOURCE_2, native: true }
+ { chapter: Chapter.SOURCE_2 }
).toMatchInlineSnapshot(`"null"`)
})
@@ -453,8 +448,7 @@ test('String representation of undefined is nice', () => {
return expectResult(
stripIndent`
stringify(undefined);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`"undefined"`)
})
@@ -464,7 +458,7 @@ test('String representation with no indent', () => {
stripIndent`
stringify(parse('x=>x;'), 0);
`,
- { chapter: Chapter.SOURCE_4, native: true }
+ { chapter: Chapter.SOURCE_4 }
).toMatchInlineSnapshot(`
"[\\"lambda_expression\\",
[[[\\"name\\", [\\"x\\", null]], null],
@@ -477,7 +471,7 @@ test('String representation with 1 space indent', () => {
stripIndent`
stringify(parse('x=>x;'), 1);
`,
- { chapter: Chapter.SOURCE_4, native: true }
+ { chapter: Chapter.SOURCE_4 }
).toMatchInlineSnapshot(`
"[\\"lambda_expression\\",
[[[\\"name\\", [\\"x\\", null]], null],
@@ -490,7 +484,7 @@ test('String representation with default (2 space) indent', () => {
stripIndent`
stringify(parse('x=>x;'));
`,
- { chapter: Chapter.SOURCE_4, native: true }
+ { chapter: Chapter.SOURCE_4 }
).toMatchInlineSnapshot(`
"[ \\"lambda_expression\\",
[ [[\\"name\\", [\\"x\\", null]], null],
@@ -503,7 +497,7 @@ test('String representation with more than 10 space indent should trim to 10 spa
stripIndent`
stringify(parse('x=>x;'), 100);
`,
- { chapter: Chapter.SOURCE_4, native: true }
+ { chapter: Chapter.SOURCE_4 }
).toMatchInlineSnapshot(`
"[ \\"lambda_expression\\",
[ [[\\"name\\", [\\"x\\", null]], null],
diff --git a/src/__tests__/tailcall-return.ts b/src/__tests__/tailcall-return.ts
index 9a3a0ce27..7133595a8 100644
--- a/src/__tests__/tailcall-return.ts
+++ b/src/__tests__/tailcall-return.ts
@@ -1,8 +1,8 @@
import { stripIndent } from '../utils/formatters'
-import { expectParsedErrorNoSnapshot, expectResult } from '../utils/testing'
+import { expectParsedError, expectResult } from '../utils/testing'
test('Check that stack is at most 10k in size', () => {
- return expectParsedErrorNoSnapshot(stripIndent`
+ return expectParsedError(stripIndent`
function f(x) {
if (x <= 0) {
return 0;
@@ -11,7 +11,7 @@ test('Check that stack is at most 10k in size', () => {
}
}
f(10000);
- `).toEqual(expect.stringMatching(/Maximum call stack size exceeded\n([^f]*f){3}/))
+ `).toMatchInlineSnapshot(`"Line 5: RangeError: Maximum call stack size exceeded"`)
}, 10000)
test('Simple tail call returns work', () => {
@@ -25,8 +25,7 @@ test('Simple tail call returns work', () => {
}
}
f(5000, 5000);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`10000`)
})
@@ -37,8 +36,7 @@ test('Tail call in conditional expressions work', () => {
return x <= 0 ? y : f(x-1, y+1);
}
f(5000, 5000);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`10000`)
})
@@ -53,8 +51,7 @@ test('Tail call in boolean operators work', () => {
}
}
f(5000, 5000);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`10000`)
})
@@ -65,8 +62,7 @@ test('Tail call in nested mix of conditional expressions boolean operators work'
return x <= 0 ? y : false || x > 0 ? f(x-1, y+1) : 'unreachable';
}
f(5000, 5000);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`10000`)
})
@@ -75,8 +71,7 @@ test('Tail calls in arrow functions work', () => {
stripIndent`
const f = (x, y) => x <= 0 ? y : f(x-1, y+1);
f(5000, 5000);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`10000`)
})
@@ -91,8 +86,7 @@ test('Tail calls in arrow block functions work', () => {
}
};
f(5000, 5000);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`10000`)
})
@@ -114,8 +108,7 @@ test('Tail calls in mutual recursion work', () => {
}
}
f(5000, 5000);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`10000`)
})
@@ -125,8 +118,7 @@ test('Tail calls in mutual recursion with arrow functions work', () => {
const f = (x, y) => x <= 0 ? y : g(x-1, y+1);
const g = (x, y) => x <= 0 ? y : f(x-1, y+1);
f(5000, 5000);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`10000`)
})
@@ -141,7 +133,6 @@ test('Tail calls in mixed tail-call/non-tail-call recursion work', () => {
}
}
f(5000, 5000, 2);
- `,
- { native: true }
+ `
).toMatchInlineSnapshot(`15000`)
})
diff --git a/src/alt-langs/__tests__/mapper.ts b/src/alt-langs/__tests__/mapper.ts
index 8c4b8374b..6aaa97ea9 100644
--- a/src/alt-langs/__tests__/mapper.ts
+++ b/src/alt-langs/__tests__/mapper.ts
@@ -1,4 +1,4 @@
-import { mockContext } from "../../mocks/context";
+import { mockContext } from "../../utils/testing/mocks";
import { Chapter, Finished } from "../../types";
import { mapResult } from "../mapper";
diff --git a/src/alt-langs/scheme/__tests__/scheme-parser.ts b/src/alt-langs/scheme/__tests__/scheme-parser.ts
index 89da8bbe5..a787f1ef7 100644
--- a/src/alt-langs/scheme/__tests__/scheme-parser.ts
+++ b/src/alt-langs/scheme/__tests__/scheme-parser.ts
@@ -1,5 +1,5 @@
import { parseError } from '../../..'
-import { mockContext } from '../../../mocks/context'
+import { mockContext } from '../../../utils/testing/mocks'
import { Chapter } from '../../../types'
import { SchemeParser } from '../../../parser/scheme'
diff --git a/src/cse-machine/__tests__/__snapshots__/cse-machine-callcc-js.ts.snap b/src/cse-machine/__tests__/__snapshots__/cse-machine-callcc-js.ts.snap
deleted file mode 100644
index 459de6d64..000000000
--- a/src/cse-machine/__tests__/__snapshots__/cse-machine-callcc-js.ts.snap
+++ /dev/null
@@ -1,77 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`call_cc can be used to return early: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let x = 1;
-call_cc((cont) => {
- x = 2;
- cont();
- x = 3;
-});
-x;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 2,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`call_cc throws error when given > 1 arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = (cont) => cont;
-1 + 2 + call_cc(f,f) + 4;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 1 arguments, but got 2.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`call_cc throws error when given no arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "1 + 2 + call_cc() + 4;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected 1 arguments, but got 0.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`call_cc works with normal functions: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "1 + 2 + call_cc((cont) => 3) + 4;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`continuations can be stored as a value: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let a = 0;
-call_cc((cont) => {
- a = cont;
-});
-a;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": [Function],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/cse-machine/__tests__/__snapshots__/cse-machine-callcc.ts.snap b/src/cse-machine/__tests__/__snapshots__/cse-machine-callcc.ts.snap
deleted file mode 100644
index df1220603..000000000
--- a/src/cse-machine/__tests__/__snapshots__/cse-machine-callcc.ts.snap
+++ /dev/null
@@ -1,100 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`basic call/cc works: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (+ 1 2 (call/cc
- (lambda (k) (k 3)))
- 4)
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 10n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`call/cc can be stored as a value: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- ;; storing a continuation
- (define a #f)
-
- (+ 1 2 3 (call/cc (lambda (k) (set! a k) 0)) 4 5)
-
- ;; continuations are treated as functions
- ;; so we can do this:
- (procedure? a)
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`call/cc can be used to escape a computation: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (define test 1)
- (call/cc (lambda (k)
- (set! test 2)
- (k 'escaped)
- (set! test 3)))
- ;; test should be 2
- test
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 2n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`call/cc throws error given >1 argument: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (+ 1 2 (call/cc
- (lambda (k) (k 3))
- 'wrongwrongwrong!)
- 4)
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 1 arguments, but got 2.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`call/cc throws error given no arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (+ 1 2 (call/cc) 4)
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 1 arguments, but got 0.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/cse-machine/__tests__/__snapshots__/cse-machine-errors.ts.snap b/src/cse-machine/__tests__/__snapshots__/cse-machine-errors.ts.snap
deleted file mode 100644
index 5d412190e..000000000
--- a/src/cse-machine/__tests__/__snapshots__/cse-machine-errors.ts.snap
+++ /dev/null
@@ -1,1049 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Builtins don't create additional errors when it's not their fault: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x) {
- return a;
-}
-map(f, list(1, 2));",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Name a not declared.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Cannot overwrite loop variables within a block: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- let z = [];
- for (let x = 0; x < 2; x = x + 1) {
- x = 1;
- }
- return false;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 4: Assignment to a for loop variable in the for loop is not allowed.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Cascading js errors work properly: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function h(p) {
- return head(p);
-}
-
-h(null);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Error: head(xs) expects a pair as argument xs, but encountered null",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when accessing temporal dead zone: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const a = 1;
-function f() {
- display(a);
- const a = 5;
-}
-f();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3: Name a declared later in current scope but not yet assigned",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when assigning to builtin - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-map = 5;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 0: Cannot assign new value to constant map.
-As map was declared as a constant, its value cannot be changed. You will have to declare a new variable.
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when assigning to builtin - verbose: expectParsedError 2`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-undefined = 5;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 0: Cannot assign new value to constant undefined.
-As undefined was declared as a constant, its value cannot be changed. You will have to declare a new variable.
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when assigning to builtin: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "map = 5;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Cannot assign new value to constant map.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when assigning to builtin: expectParsedError 2`] = `
-Object {
- "alertResult": Array [],
- "code": "undefined = 5;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Cannot assign new value to constant undefined.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function in tail call with too many arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-const g = () => 1;
-const f = x => g(x);
-f(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 15: Expected 0 arguments, but got 1.
-Try calling function g again, but with 0 arguments instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function in tail call with too many arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const g = () => 1;
-const f = x => g(x);
-f(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 0 arguments, but got 1.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function with too few arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- const f = x => x;
- f();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 2: Expected 1 arguments, but got 0.
-Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function with too few arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = x => x;
-f();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 1 arguments, but got 0.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function with too many arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- const f = x => x;
- f(1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 2: Expected 1 arguments, but got 2.
-Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling arrow function with too many arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = x => x;
-f(1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 1 arguments, but got 2.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling builtin function in with too few arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "parse_int(\\"\\");",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected 2 arguments, but got 1.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling builtin function in with too many arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number(1, 2, 3);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected 1 arguments, but got 3.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function from member expression with too many arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- const f = [x => x];
- f[0](1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 2: Expected 1 arguments, but got 2.
-Try calling function f[0] again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function from member expression with too many arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = [x => x];
-f[0](1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 1 arguments, but got 2.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function with too few arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- function f(x) {
- return x;
- }
- f();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 5, Column 2: Expected 1 arguments, but got 0.
-Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function with too few arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x) {
- return x;
-}
-f();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 4: Expected 1 arguments, but got 0.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function with too many arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- function f(x) {
- return x;
- }
- f(1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 5, Column 2: Expected 1 arguments, but got 2.
-Try calling function f again, but with 1 argument instead. Remember that arguments are separated by a ',' (comma).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling function with too many arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x) {
- return x;
-}
-f(1, 2);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 4: Expected 1 arguments, but got 2.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value "string" - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- 'string'();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: Calling non-function value \\"string\\".
-Because \\"string\\" is not a function, you cannot run \\"string\\"().
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value "string": expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "'string'();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value \\"string\\".",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value 0 - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- 0();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: Calling non-function value 0.
-Because 0 is not a function, you cannot run 0(). If you were planning to perform multiplication by 0, you need to use the * operator.
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value 0: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "0();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value 0.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value array - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-[1]();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 0: Calling non-function value [1].
-Because [1] is not a function, you cannot run [1]().
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value array: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "[1]();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value [1].",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value null - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- null();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: null literals are not allowed.
-They're not part of the Source §1 specs.
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value null: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "null();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: null literals are not allowed.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value true - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- true();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: Calling non-function value true.
-Because true is not a function, you cannot run true().
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value true: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "true();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value true.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value undefined - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- undefined();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: Calling non-function value undefined.
-Because undefined is not a function, you cannot run undefined().
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value undefined with arguments - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
- undefined(1, true);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 2: Calling non-function value undefined.
-Because undefined is not a function, you cannot run undefined(1, true).
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value undefined with arguments: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "undefined(1, true);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value undefined.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when calling non function value undefined: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "undefined();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Calling non-function value undefined.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring const after function --verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-function f() {}
-const f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 6: SyntaxError: Identifier 'f' has already been declared (3:6)
-There is a syntax error in your program
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring const after function: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f() {}
-const f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:6)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring constant as variable: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = x => x;
-let f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:4)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring constant: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = x => x;
-const f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:6)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after const --verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-const f = x => x;
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 9: SyntaxError: Identifier 'f' has already been declared (3:9)
-There is a syntax error in your program
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after const: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = x => x;
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:9)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after function --verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-function f() {}
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 9: SyntaxError: Identifier 'f' has already been declared (3:9)
-There is a syntax error in your program
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after function: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f() {}
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:9)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after let --verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-let f = x => x;
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 9: SyntaxError: Identifier 'f' has already been declared (3:9)
-There is a syntax error in your program
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring function after let: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let f = x => x;
-function f() {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:9)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring let after function --verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-function f() {}
-let f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3, Column 4: SyntaxError: Identifier 'f' has already been declared (3:4)
-There is a syntax error in your program
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring let after function: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f() {}
-let f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:4)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring variable as constant: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let f = x => x;
-const f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:6)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error when redeclaring variable: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let f = x => x;
-let f = x => x;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: SyntaxError: Identifier 'f' has already been declared (2:4)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error with too few arguments passed to rest parameters: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function rest(a, b, ...c) {}
-rest(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2: Expected 2 or more arguments, but got 1.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Error with too many arguments passed to math_sin: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "math_sin(7,8);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected 1 arguments, but got 2.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`In a block, every going-to-be-defined variable in the block cannot be accessed until it has been defined in the block.: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const a = 1;
-{
- a + a;
- const a = 10;
-}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3: Name a declared later in current scope but not yet assigned",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Nice errors when errors occur inside builtins: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "parse_int(\\"10\\");",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected 2 arguments, but got 1.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Nice errors when errors occur inside builtins: expectParsedError 2`] = `
-Object {
- "alertResult": Array [],
- "code": "parse(\\"'\\");",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: ParseError: SyntaxError: Unterminated string constant (1:0)",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No error when calling display function in with variable arguments: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display(1);
-display(1, \\"test\\");",
- "displayResult": Array [
- "1",
- "test 1",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No error when calling list function in with variable arguments: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "list();
-list(1);
-list(1, 2, 3);
-list(1, 2, 3, 4, 5, 6, 6);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- 1,
- Array [
- 2,
- Array [
- 3,
- Array [
- 4,
- Array [
- 5,
- Array [
- 6,
- Array [
- 6,
- null,
- ],
- ],
- ],
- ],
- ],
- ],
- ],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No error when calling math_max function in with variable arguments: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "math_max();
-math_max(1, 2);
-math_max(1, 2, 3);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 3,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No error when calling math_min function in with variable arguments: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "math_min();
-math_min(1, 2);
-math_min(1, 2, 3);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No error when calling stringify function in with variable arguments: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "stringify(1, 2);
-stringify(1, 2, 3);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "1",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`No hoisting of functions. Only the name is hoisted like let and const: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const v = f();
-function f() {
- return 1;
-}
-v;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Name f declared later in current scope but not yet assigned",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Shadowed variables may not be assigned to until declared in the current scope: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let variable = 1;
-function test(){
- variable = 100;
- let variable = true;
- return variable;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3: Name variable not declared.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Type error with <number> * <nonnumber>, error line at <number>, not <nonnumber>: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "12
-*
-'string';",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected number on right hand side of operation, got string.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Type error with non boolean in if statement, error line at if statement, not at 1: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "if (
-1
-) {
- 2;
-} else {}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Expected boolean as condition, got number.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Undefined variable error is thrown - verbose: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "\\"enable verbose\\";
-im_undefined;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 2, Column 0: Name im_undefined not declared.
-Before you can read the value of im_undefined, you need to declare it as a variable or a constant. You can do this using the let or const keywords.
-",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Undefined variable error is thrown: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "im_undefined;",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Name im_undefined not declared.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Undefined variables are caught even when unreached: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const a = 1;
-if (false) {
- im_undefined;
-} else {
- a;
-}",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3: Name im_undefined not declared.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/cse-machine/__tests__/__snapshots__/cse-machine-return-regressions.ts.snap b/src/cse-machine/__tests__/__snapshots__/cse-machine-return-regressions.ts.snap
deleted file mode 100644
index 4a6940382..000000000
--- a/src/cse-machine/__tests__/__snapshots__/cse-machine-return-regressions.ts.snap
+++ /dev/null
@@ -1,359 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Bare early returns in for loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function f() {
- for (let i = 0; i < 100; i = i + 1) {
- return i+1;
- unreachable();
- }
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Bare early returns in if statements work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function f() {
- if (true) {
- return 1;
- unreachable();
- } else {}
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Bare early returns in while loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function f() {
- while (true) {
- return 1;
- unreachable();
- }
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Bare early returns work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function f() {
- return 1;
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Calling unreachable results in error: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function f() {
- unreachable();
- return 0;
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 3: Expected number on right hand side of operation, got boolean.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Recursive call early returns in for loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- for (let i = 0; i < 100; i = i + 1) {
- return id(i+1) + id(i+2);
- }
- return 0;
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 3,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Recursive call early returns in if statements work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- if (true) {
- return id(1) + id(2);
- unreachable();
- } else {}
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 3,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Recursive call early returns in while loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- while (true) {
- return id(1) + id(2);
- unreachable();
- }
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 3,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Recursive call early returns work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- return id(1) + id(2);
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 3,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call early returns in for loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- for (let i = 0; i < 100; i = i + 1) {
- return id(i+1);
- unreachable();
- }
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call early returns in if statements work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- if (true) {
- return id(1);
- unreachable();
- } else {}
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call early returns in while loops work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- while (true) {
- return id(1);
- unreachable();
- }
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call early returns work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- function unreachable() {
- return 1 < true; // Will cause an error
- }
- function id(x) {
- return x;
- }
- function f() {
- return id(1);
- unreachable();
- return 0;
- unreachable();
- }
- f();
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/cse-machine/__tests__/__snapshots__/cse-machine-stdlib.ts.snap b/src/cse-machine/__tests__/__snapshots__/cse-machine-stdlib.ts.snap
index ef86d0b26..7db840268 100644
--- a/src/cse-machine/__tests__/__snapshots__/cse-machine-stdlib.ts.snap
+++ b/src/cse-machine/__tests__/__snapshots__/cse-machine-stdlib.ts.snap
@@ -1,621 +1,13 @@
// Jest Snapshot v1, https://goo.gl/fbAQLP
-exports[`Builtins work as expected 0: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "display('message');",
- "displayResult": Array [
- "\\"message\\"",
- ],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "message",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 1 1`] = `"Line 1: Error: \\"error!\\""`;
-exports[`Builtins work as expected 1: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "error('error!');",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Error: \\"error!\\"",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 40 1`] = `"Line 1: Error: head(xs) expects a pair as argument xs, but encountered null"`;
-exports[`Builtins work as expected 2: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_undefined(undefined);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 41 1`] = `"Line 1: Error: tail(xs) expects a pair as argument xs, but encountered null"`;
-exports[`Builtins work as expected 3: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_undefined(null);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 42 1`] = `"Line 1: Error: head(xs) expects a pair as argument xs, but encountered 1"`;
-exports[`Builtins work as expected 4: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_null(undefined);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 43 1`] = `"Line 1: Error: tail(xs) expects a pair as argument xs, but encountered 1"`;
-exports[`Builtins work as expected 5: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_null(null);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 6: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_string('string');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 7: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_string('true');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 8: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_string('1');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 9: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_string(true);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 10: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_string(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 11: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number('string');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 12: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number('true');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 13: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number('1');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 14: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number(true);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 15: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 16: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_boolean('string');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 17: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_boolean('true');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 18: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_boolean('1');",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 19: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_boolean(true);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 20: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_boolean(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 21: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_function(display);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 22: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_function(x => x);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 23: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x) {
- return x;
-}
-is_function(f);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 24: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_function(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 25: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_array(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 26: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_array(pair(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 27: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_array([1]);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 28: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "array_length([1]);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 29: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "parse_int('10', 10);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 30: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "parse_int('10', 2);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 2,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 31: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_number(get_time());",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 32: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const start = get_time();
-function repeatUntilDifferentTime() {
- if (start === get_time()) {
- return repeatUntilDifferentTime();
- } else {
- return true;
- }
-}
-repeatUntilDifferentTime();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 33: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "pair(1, 2);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- 1,
- 2,
- ],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 34: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "list(1, 2);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- 1,
- Array [
- 2,
- null,
- ],
- ],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 35: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_list(1);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 36: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_list(pair(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 37: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "is_list(list(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 38: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "head(pair(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 39: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "tail(pair(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 2,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 40: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "head(null);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Error: head(xs) expects a pair as argument xs, but encountered null",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 41: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "tail(null);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Error: tail(xs) expects a pair as argument xs, but encountered null",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 42: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "head(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Error: head(xs) expects a pair as argument xs, but encountered 1",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 43: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "tail(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 1: Error: tail(xs) expects a pair as argument xs, but encountered 1",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 44: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "length(list(1, 2));",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 2,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Builtins work as expected 45: fails 1`] = `
-Object {
- "alertResult": Array [],
- "code": "length(1);",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Line 33: Error: tail(xs) expects a pair as argument xs, but encountered 1",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
+exports[`Builtins work as expected 45 1`] = `"Line 33: Error: tail(xs) expects a pair as argument xs, but encountered 1"`;
diff --git a/src/cse-machine/__tests__/__snapshots__/cse-machine.ts.snap b/src/cse-machine/__tests__/__snapshots__/cse-machine.ts.snap
deleted file mode 100644
index 68b85f4c7..000000000
--- a/src/cse-machine/__tests__/__snapshots__/cse-machine.ts.snap
+++ /dev/null
@@ -1,568 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`Array literals are unpacked in the correct order: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let d = 0;
-let c = [ d = d * 10 + 1, d = d * 10 + 2, d = d * 10 + 3];
-d;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 123,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Array literals work as expected: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let c = [1, 2, 3];
-c;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- 1,
- 2,
- 3,
- ],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Breaks, continues and returns are detected properly inside loops: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f() {
- let i = 0;
- while(i < 10) {
- i = i + 1;
- if (i === 1) {
- i = 1;
- i = 1;
- } else if (i === 2) {
- i = 2;
- continue;
- } else if (i === 3) {
- i = 3;
- return i;
- } else if (i === 4) {
- i = 4;
- break;
- }
- }
- return i;
-}
-f();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 3,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Conditional statements are value producing always: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function fact(n) {
- if (n === 0) {
- 2;
- return 1;
- }
- if (true) {
- let i = 1;
- i = i - 1;
- } else {
- 2;
- }
- if (false) {
- 2;
- } else {
- const i = 1;
- }
- return n * fact(n - 1);
- }
-fact(5);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 120,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Environment reset is inserted when only instructions are in control stack: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const a = (v => v)(0);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": undefined,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Nullary functions properly restore environment 1: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f() {
- function g(t) {
- return 0;
- }
- return g;
-}
-const h = f();
-h(100);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 0,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Nullary functions properly restore environment 2: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f() {
- const a = 1;
- return a;
-}
-const a = f();
-a;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Simple tail call returns work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y) {
- if (x <= 0) {
- return y;
- } else {
- return f(x-1, y+1);
- }
-}
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call in boolean operators work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y) {
- if (x <= 0) {
- return y;
- } else {
- return false || f(x-1, y+1);
- }
-}
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call in conditional expressions work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y) {
- return x <= 0 ? y : f(x-1, y+1);
-}
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail call in nested mix of conditional expressions boolean operators work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y) {
- return x <= 0 ? y : false || x > 0 ? f(x-1, y+1) : 'unreachable';
-}
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail calls in arrow block functions work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = (x, y) => {
- if (x <= 0) {
- return y;
- } else {
- return f(x-1, y+1);
- }
-};
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail calls in arrow functions work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = (x, y) => x <= 0 ? y : f(x-1, y+1);
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail calls in mixed tail-call/non-tail-call recursion work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y, z) {
- if (x <= 0) {
- return y;
- } else {
- return f(x-1, y+f(0, z, 0), z);
- }
-}
-f(5000, 5000, 2);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 15000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail calls in mutual recursion with arrow functions work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const f = (x, y) => x <= 0 ? y : g(x-1, y+1);
-const g = (x, y) => x <= 0 ? y : f(x-1, y+1);
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Tail calls in mutual recursion work: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function f(x, y) {
- if (x <= 0) {
- return y;
- } else {
- return g(x-1, y+1);
- }
-}
-function g(x, y) {
- if (x <= 0) {
- return y;
- } else {
- return f(x-1, y+1);
- }
-}
-f(5000, 5000);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 10000,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`breaks, continues are properly detected in child blocks 1: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let i = 0;
-for (i = 1; i < 5; i = i + 1) {
- {
- const a = i;
- if (i === 1) {
- continue;
- }
- }
-
- {
- const a = i;
- if (i === 2) {
- break;
- }
- }
-}
-i;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 2,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`breaks, continues are properly detected in child blocks 2: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "let a = 0;
-for (let i = 1; i < 5; i = i + 1) {
- {
- const x = 0;
- a = i;
- if (i === 1) {
- continue;
- }
- }
-
- {
- const x = 0;
- a = i;
- if (i === 2) {
- break;
- }
- }
-}
-a;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 2,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`const uses block scoping instead of function scoping: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- const x = true;
- if(true) {
- const x = false;
- } else {
- const x = false;
- }
- return x;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`continue in while loops are working as intended: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- let i = 0;
- let j = false;
- while (i <= 10){
- if (i === 10){
- j = true;
- i = i + 1;
- continue;
- }
- j = false;
- i = i + 1;
- }
- return j;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`for loop \`let\` variables are copied into the block scope: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- let z = [];
- for (let x = 0; x < 10; x = x + 1) {
- z[x] = () => x;
- }
- return z[1]();
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 1,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`for loops use block scoping instead of function scoping: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- let x = true;
- for (let x = 1; x > 0; x = x - 1) {
- }
- return x;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`let uses block scoping instead of function scoping: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- let x = true;
- if(true) {
- let x = false;
- } else {
- let x = false;
- }
- return x;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`standalone block statements: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- const x = true;
- {
- const x = false;
- }
- return x;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`streams and its pre-defined/pre-built functions are working as intended: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function make_alternating_stream(stream) {
- return pair(head(stream), () => make_alternating_stream(
- negate_whole_stream(
- stream_tail(stream))));
-}
-
-function negate_whole_stream(stream) {
- return pair(-head(stream), () => negate_whole_stream(stream_tail(stream)));
-}
-
-const ones = pair(1, () => ones);
-list_ref(eval_stream(make_alternating_stream(enum_stream(1, 9)), 9), 8);",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": 9,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`streams can be created and functions with no return statements are still evaluated properly: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "const s = stream(true, false, undefined, 1, x=>x, null, -123, head);
-const result = [];
-stream_for_each(item => {result[array_length(result)] = item;}, s);
-stream_ref(s,4)(22) === 22 && stream_ref(s,7)(pair('', '1')) === '1' && result;",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": false,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`while loops use block scoping instead of function scoping: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "function test(){
- let x = true;
- while (true) {
- let x = false;
- break;
- }
- return x;
-}
-test();",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/cse-machine/__tests__/__snapshots__/cset-machine-apply.ts.snap b/src/cse-machine/__tests__/__snapshots__/cset-machine-apply.ts.snap
deleted file mode 100644
index e640dd35d..000000000
--- a/src/cse-machine/__tests__/__snapshots__/cset-machine-apply.ts.snap
+++ /dev/null
@@ -1,84 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`eval of strings: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval \\"hello\\")
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "hello",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`incorrect use of apply throws error (insufficient arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (apply)
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Expected 2 arguments, but got 0.",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`incorrect use of apply throws error (last argument not a list): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (apply + 1 2 3)
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: Last argument of apply must be a list",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`multi-operand apply: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (define args '(1 2 3 4 5))
- (apply + 6 7 8 9 10 args)
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 55n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`two-operand apply: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (define args '(1 2))
- (apply + args)
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 3n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/cse-machine/__tests__/__snapshots__/cset-machine-eval.ts.snap b/src/cse-machine/__tests__/__snapshots__/cset-machine-eval.ts.snap
deleted file mode 100644
index 1d4858bf9..000000000
--- a/src/cse-machine/__tests__/__snapshots__/cset-machine-eval.ts.snap
+++ /dev/null
@@ -1,224 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`eval of application: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(+ 1 2))
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 3n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`eval of begin: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(begin 1 2 3))
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 3n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`eval of booleans: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval #t)
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": true,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`eval of define: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define x 1))
- x
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 1n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`eval of empty list: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '())
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: Cannot evaluate null",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`eval of if: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(if #t 1 2))
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 1n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`eval of lambda: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(lambda (x) x))
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": [Function],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`eval of numbers: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval 1)
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 1n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`eval of quote: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(quote (1 2 3)))
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- SchemeInteger {
- "numberType": 1,
- "value": 1n,
- },
- Array [
- SchemeInteger {
- "numberType": 1,
- "value": 2n,
- },
- Array [
- SchemeInteger {
- "numberType": 1,
- "value": 3n,
- },
- null,
- ],
- ],
- ],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`eval of set!: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (define x 2)
- (eval '(set! x 1))
- x
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 1n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`eval of strings: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval \\"hello\\")
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": "hello",
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`eval of symbols: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (define hello 1)
- (eval 'hello)
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 1n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/cse-machine/__tests__/__snapshots__/cset-machine-macros.ts.snap b/src/cse-machine/__tests__/__snapshots__/cset-machine-macros.ts.snap
deleted file mode 100644
index 44a337150..000000000
--- a/src/cse-machine/__tests__/__snapshots__/cset-machine-macros.ts.snap
+++ /dev/null
@@ -1,97 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`definition of a macro: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (define-syntax my-let
- (syntax-rules ()
- ((_ ((var expr) ...) body ...)
- ((lambda (var ...) body ...) expr ...))))
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": undefined,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`failed usage of a macro (no matching pattern): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (define-syntax my-let
- (syntax-rules ()
- ((_ ((var expr) ...) body ...)
- ((lambda (var ...) body ...) expr ...))))
- (my-let ((x 1) y)
- (+ x y))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: No matching transformer found for macro my-let",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`use of a macro: expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (define-syntax my-let
- (syntax-rules ()
- ((_ ((var expr) ...) body ...)
- ((lambda (var ...) body ...) expr ...))))
- (my-let ((x 1) (y 2))
- (+ x y))
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 3n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`use of a more complex macro (recursive): expectResult 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
-(define-syntax define-match
- (syntax-rules ()
- ; vars is a pair
- ((_ (front . rest) val)
- (begin
- (if (not (pair? val))
- (error \\"define-match: vars and vals do not match\\"))
- (define-match front (car val))
- (define-match rest (cdr val))))
- ; vars is nil
- ((_ () val)
- ; do nothing
- (if #f #f))
- ; vars is a single symbol
- ((_ sym val)
- (define sym val))))
- (define-match ((x y) z) '((1 2) 3))
- (+ x y z)
- ",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": SchemeInteger {
- "numberType": 1,
- "value": 6n,
- },
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/cse-machine/__tests__/__snapshots__/cset-machine.ts.snap b/src/cse-machine/__tests__/__snapshots__/cset-machine.ts.snap
deleted file mode 100644
index fc7301ef5..000000000
--- a/src/cse-machine/__tests__/__snapshots__/cset-machine.ts.snap
+++ /dev/null
@@ -1,376 +0,0 @@
-// Jest Snapshot v1, https://goo.gl/fbAQLP
-
-exports[`evaluating a poorly formed begin throws error (insufficient arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(begin))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: begin requires at least 1 argument!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define throws error (attempt to redefine special form): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define (if x y) 4))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: Cannot shadow special form if with a definition!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define throws error (ill formed define-function): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define (x 1 2 3) 4))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: Invalid arguments for lambda!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define throws error (insufficient arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: define requires at least 2 arguments!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define throws error (too many arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define x 1 2 3))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: define requires 2 arguments!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define-syntax throws error (attempt to shadow special form): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define-syntax if 4))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: Cannot shadow special form if with a macro!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define-syntax throws error (insufficient arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define-syntax))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: define-syntax requires 2 arguments!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define-syntax throws error (list is not syntax-rules): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define-syntax x (foo bar)))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: define-syntax requires a syntax-rules transformer!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define-syntax throws error (no syntax-rules list): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define-syntax x 1))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: define-syntax requires a syntax-rules transformer!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define-syntax throws error (syntax is not a symbol): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define-syntax 1 4))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: define-syntax requires a symbol!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define-syntax throws error (syntax-rules has non-list rules): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define-syntax x (syntax-rules (x) 1)))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: Invalid syntax-rules rule!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define-syntax throws error (syntax-rules has non-symbol literals): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define-syntax x (syntax-rules (1 2) (1 1))))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: Invalid syntax-rules literals!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define-syntax throws error (syntax-rules has poor literals list): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define-syntax x (syntax-rules x (1 1))))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: Invalid syntax-rules literals!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define-syntax throws error (syntax-rules too few arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define-syntax x (syntax-rules)))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: syntax-rules requires at least 2 arguments!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed define-syntax throws error (too many arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(define-syntax x 1 2 3))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: define-syntax requires 2 arguments!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed if throws error (insufficient arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(if))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: if requires at least 2 arguments!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed if throws error (too many arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(if #t 1 2 3))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: if requires at most 3 arguments!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed lambda throws error: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(lambda (1 2 3) x))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: Invalid arguments for lambda!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed quote throws error (insufficient arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(quote))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: quote requires 1 argument!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed quote throws error (too many arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(quote x y))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: quote requires 1 argument!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed set! throws error (attempt to set! special form): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(set! if 4))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: Cannot overwrite special form if with a value!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed set! throws error (insufficient arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(set!))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: set! requires 2 arguments!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a poorly formed set! throws error (too many arguments): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(set! x 1 2 3))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: set! requires 2 arguments!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating a syntax-rules expression (should not exist outside of define-syntax): expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '(syntax-rules (x) (1 1)))
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: syntax-rules must only exist within define-syntax!",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`evaluating null throws error: expectParsedError 1`] = `
-Object {
- "alertResult": Array [],
- "code": "
- (eval '())
- ",
- "displayResult": Array [],
- "numErrors": 1,
- "parsedErrors": "Error: Cannot evaluate null",
- "result": undefined,
- "resultStatus": "error",
- "visualiseListResult": Array [],
-}
-`;
diff --git a/src/cse-machine/__tests__/continuations.ts b/src/cse-machine/__tests__/continuations.ts
index ae957fee3..27b8db157 100644
--- a/src/cse-machine/__tests__/continuations.ts
+++ b/src/cse-machine/__tests__/continuations.ts
@@ -1,4 +1,4 @@
-import { mockContext } from '../../mocks/context'
+import { mockContext } from '../../utils/testing/mocks'
import { Call_cc, Continuation, isCallWithCurrentContinuation } from '../continuations'
import { Control, Stash, Transformers } from '../interpreter'
diff --git a/src/cse-machine/__tests__/cse-machine-errors.ts b/src/cse-machine/__tests__/cse-machine-errors.ts
index 9fa1bdc78..4c4dc199e 100644
--- a/src/cse-machine/__tests__/cse-machine-errors.ts
+++ b/src/cse-machine/__tests__/cse-machine-errors.ts
@@ -3,15 +3,23 @@ import * as _ from 'lodash'
import { Chapter, Variant } from '../../types'
import { stripIndent } from '../../utils/formatters'
-import {
- expectDifferentParsedErrors,
- expectParsedError,
- expectParsedErrorNoSnapshot,
- expectResult
-} from '../../utils/testing'
+import { expectParsedError, expectResult, testFailure } from '../../utils/testing'
+import { TestOptions } from '../../utils/testing/types'
jest.spyOn(_, 'memoize').mockImplementation(func => func as any)
+function expectDifferentParsedErrors(code1: string, code2: string, options: TestOptions = {}) {
+ return expect(
+ testFailure(code1, options).then(error1 => {
+ expect(
+ testFailure(code2, options).then(error2 => {
+ return expect(error1).not.toEqual(error2)
+ })
+ )
+ })
+ ).resolves
+}
+
const undefinedVariable = stripIndent`
im_undefined;
`
@@ -149,7 +157,7 @@ test("Builtins don't create additional errors when it's not their fault", () =>
})
test('Infinite recursion with a block bodied function', () => {
- return expectParsedErrorNoSnapshot(
+ return expectParsedError(
stripIndent`
function i(n) {
return n === 0 ? 0 : 1 + i(n-1);
@@ -161,7 +169,7 @@ test('Infinite recursion with a block bodied function', () => {
}, 15000)
test('Infinite recursion with function calls in argument', () => {
- return expectParsedErrorNoSnapshot(
+ return expectParsedError(
stripIndent`
function i(n, redundant) {
return n === 0 ? 0 : 1 + i(n-1, r());
@@ -178,7 +186,7 @@ test('Infinite recursion with function calls in argument', () => {
}, 20000)
test('Infinite recursion of mutually recursive functions', () => {
- return expectParsedErrorNoSnapshot(
+ return expectParsedError(
stripIndent`
function f(n) {
return n === 0 ? 0 : 1 + g(n - 1);
@@ -931,7 +939,7 @@ test('Cascading js errors work properly', () => {
})
test('Check that stack is at most 10k in size', () => {
- return expectParsedErrorNoSnapshot(
+ return expectParsedError(
stripIndent`
function f(x) {
if (x <= 0) {
diff --git a/src/cse-machine/__tests__/cse-machine-heap.ts b/src/cse-machine/__tests__/cse-machine-heap.ts
index 3565ce6d7..fed7ab1d2 100644
--- a/src/cse-machine/__tests__/cse-machine-heap.ts
+++ b/src/cse-machine/__tests__/cse-machine-heap.ts
@@ -1,4 +1,4 @@
-import { mockClosure, mockContext } from '../../mocks/context'
+import { mockClosure, mockContext } from '../../utils/testing/mocks'
import { runCodeInSource } from '../../runner'
import { Chapter } from '../../types'
import { stripIndent } from '../../utils/formatters'
@@ -11,7 +11,7 @@ test('Heap works correctly', () => {
expect(heap1.getHeap()).toMatchInlineSnapshot(`Set {}`)
const arr = [0] as EnvArray
- const closure = mockClosure(true)
+ const closure = mockClosure()
heap1.add(arr, closure)
heap1.add(arr)
expect(heap1.contains([0] as EnvArray)).toMatchInlineSnapshot(`false`)
@@ -28,7 +28,7 @@ test('Heap works correctly', () => {
`)
const heap2 = new Heap()
- expect(heap1.move(mockClosure(true), heap2)).toMatchInlineSnapshot(`false`)
+ expect(heap1.move(mockClosure(), heap2)).toMatchInlineSnapshot(`false`)
expect(heap1.move(arr, heap2)).toMatchInlineSnapshot(`true`)
expect(heap1.contains(arr)).toMatchInlineSnapshot(`false`)
expect(heap1.getHeap()).toMatchInlineSnapshot(`
diff --git a/src/cse-machine/__tests__/cse-machine-runtime-context.ts b/src/cse-machine/__tests__/cse-machine-runtime-context.ts
index 4c3e48e0a..5a65ceeb8 100644
--- a/src/cse-machine/__tests__/cse-machine-runtime-context.ts
+++ b/src/cse-machine/__tests__/cse-machine-runtime-context.ts
@@ -1,6 +1,6 @@
import * as es from 'estree'
import { IOptions } from '../..'
-import { mockContext } from '../../mocks/context'
+import { mockContext } from '../../utils/testing/mocks'
import { parse } from '../../parser/parser'
import { runCodeInSource } from '../../runner'
import { Chapter, RecursivePartial } from '../../types'
diff --git a/src/cse-machine/__tests__/cse-machine-stdlib.ts b/src/cse-machine/__tests__/cse-machine-stdlib.ts
index a9c8d93ff..88a7c19e1 100644
--- a/src/cse-machine/__tests__/cse-machine-stdlib.ts
+++ b/src/cse-machine/__tests__/cse-machine-stdlib.ts
@@ -436,11 +436,7 @@ test.each([
variant: Variant.EXPLICIT_CONTROL
}).toEqual(returnValue)
} else {
- return snapshotFailure(
- stripIndent(snippet),
- { chapter, variant: Variant.EXPLICIT_CONTROL },
- 'fails'
- )
+ return snapshotFailure(stripIndent(snippet), { chapter, variant: Variant.EXPLICIT_CONTROL })
}
}
)
diff --git a/src/cse-machine/__tests__/cse-machine-unique-id.ts b/src/cse-machine/__tests__/cse-machine-unique-id.ts
index 75a972fef..aa421b1f1 100644
--- a/src/cse-machine/__tests__/cse-machine-unique-id.ts
+++ b/src/cse-machine/__tests__/cse-machine-unique-id.ts
@@ -1,4 +1,4 @@
-import { mockContext } from '../../mocks/context'
+import { mockContext } from '../../utils/testing/mocks'
import { Chapter, type Context, type Environment } from '../../types'
import { stripIndent } from '../../utils/formatters'
import { runCodeInSource } from '../../runner'
diff --git a/src/index.ts b/src/index.ts
index 46028b898..f3e007085 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -34,7 +34,6 @@ import { getKeywords, getProgramNames, NameDeclaration } from './name-extractor'
import { htmlRunner, resolvedErrorPromise, sourceFilesRunner } from './runner'
export interface IOptions {
- scheduler: 'preemptive' | 'async'
steps: number
stepLimit: number
executionMethod: ExecutionMethod
diff --git a/src/infiniteLoops/__tests__/errors.ts b/src/infiniteLoops/__tests__/errors.ts
index 5ca59db4e..52f076aef 100644
--- a/src/infiniteLoops/__tests__/errors.ts
+++ b/src/infiniteLoops/__tests__/errors.ts
@@ -3,7 +3,7 @@ import * as es from 'estree'
import { ExceptionError } from '../../errors/errors'
import { RuntimeSourceError } from '../../errors/runtimeSourceError'
import { TimeoutError } from '../../errors/timeoutErrors'
-import { mockContext } from '../../mocks/context'
+import { mockContext } from '../../utils/testing/mocks'
import { Chapter } from '../../types'
import {
getInfiniteLoopData,
diff --git a/src/infiniteLoops/__tests__/instrument.ts b/src/infiniteLoops/__tests__/instrument.ts
index 56886b86a..e292ef2a0 100644
--- a/src/infiniteLoops/__tests__/instrument.ts
+++ b/src/infiniteLoops/__tests__/instrument.ts
@@ -1,6 +1,6 @@
import { Program } from 'estree'
-import { mockContext } from '../../mocks/context'
+import { mockContext } from '../../utils/testing/mocks'
import { parse } from '../../parser/parser'
import { Chapter } from '../../types'
import { evaluateBinaryExpression, evaluateUnaryExpression } from '../../utils/operators'
@@ -12,24 +12,26 @@ import {
function mockFunctionsAndState() {
const theState = undefined
- const functions = {}
const returnFirst = (...args: any[]) => args[0]
const nothing = (..._args: any[]) => {}
- functions[functionNames.nothingFunction] = nothing
- functions[functionNames.concretize] = returnFirst
- functions[functionNames.hybridize] = returnFirst
- functions[functionNames.wrapArg] = returnFirst
- functions[functionNames.dummify] = returnFirst
- functions[functionNames.saveBool] = returnFirst
- functions[functionNames.saveVar] = returnFirst
- functions[functionNames.preFunction] = nothing
- functions[functionNames.returnFunction] = returnFirst
- functions[functionNames.postLoop] = (_: any, res?: any) => res
- functions[functionNames.enterLoop] = nothing
- functions[functionNames.exitLoop] = nothing
- functions[functionNames.trackLoc] = (_1: any, _2: any, fn?: any) => (fn ? fn() : undefined)
- functions[functionNames.evalB] = evaluateBinaryExpression
- functions[functionNames.evalU] = evaluateUnaryExpression
+
+ const functions = {
+ [functionNames.nothingFunction]: nothing,
+ [functionNames.concretize]: returnFirst,
+ [functionNames.hybridize]: returnFirst,
+ [functionNames.wrapArg]: returnFirst,
+ [functionNames.dummify]: returnFirst,
+ [functionNames.saveBool]: returnFirst,
+ [functionNames.saveVar]: returnFirst,
+ [functionNames.preFunction]: nothing,
+ [functionNames.returnFunction]: returnFirst,
+ [functionNames.postLoop]: (_: any, res?: any) => res,
+ [functionNames.enterLoop]: nothing,
+ [functionNames.exitLoop]: nothing,
+ [functionNames.trackLoc]: (_1: any, _2: any, fn?: any) => (fn ? fn() : undefined),
+ [functionNames.evalB]: evaluateBinaryExpression,
+ [functionNames.evalU]: evaluateUnaryExpression
+ }
return [functions, theState]
}
diff --git a/src/infiniteLoops/__tests__/runtime.ts b/src/infiniteLoops/__tests__/runtime.ts
index 9e7b92880..e12b54793 100644
--- a/src/infiniteLoops/__tests__/runtime.ts
+++ b/src/infiniteLoops/__tests__/runtime.ts
@@ -2,7 +2,7 @@ import type es from 'estree'
import { runInContext } from '../..'
import createContext from '../../createContext'
-import { mockContext } from '../../mocks/context'
+import { mockContext } from '../../utils/testing/mocks'
import { parse } from '../../parser/parser'
import { Chapter, Variant } from '../../types'
import { getInfiniteLoopData, InfiniteLoopError, InfiniteLoopErrorType } from '../errors'
diff --git a/src/modules/loader/__tests__/loader.ts b/src/modules/loader/__tests__/loader.ts
index 3bc037315..6ad94fba0 100644
--- a/src/modules/loader/__tests__/loader.ts
+++ b/src/modules/loader/__tests__/loader.ts
@@ -1,9 +1,9 @@
-import { mockContext } from '../../../mocks/context'
+import { mockContext } from '../../../utils/testing/mocks'
import { Chapter, Variant } from '../../../types'
import { ModuleConnectionError, ModuleNotFoundError } from '../../errors'
import * as moduleLoader from '../loaders'
import type { ModuleDocumentation, ModuleManifest } from '../../moduleTypes'
-import { asMockedFunc } from '../../../utils/testing'
+import { asMockedFunc } from '../../../utils/testing/misc'
const moduleMocker = jest.fn()
global.fetch = jest.fn()
diff --git a/src/modules/loader/__tests__/requireProvider.ts b/src/modules/loader/__tests__/requireProvider.ts
index 3c787e9fd..91e5ad87e 100644
--- a/src/modules/loader/__tests__/requireProvider.ts
+++ b/src/modules/loader/__tests__/requireProvider.ts
@@ -1,4 +1,4 @@
-import { mockContext } from '../../../mocks/context'
+import { mockContext } from '../../../utils/testing/mocks'
import { Chapter } from '../../../types'
import { getRequireProvider } from '../requireProvider'
diff --git a/src/modules/preprocessor/__tests__/analyzer.ts b/src/modules/preprocessor/__tests__/analyzer.ts
index 522102dd3..80a41ebb8 100644
--- a/src/modules/preprocessor/__tests__/analyzer.ts
+++ b/src/modules/preprocessor/__tests__/analyzer.ts
@@ -11,7 +11,7 @@ import { stripIndent } from '../../../utils/formatters'
import parseProgramsAndConstructImportGraph from '../linker'
import analyzeImportsAndExports from '../analyzer'
import { parse } from '../../../parser/parser'
-import { mockContext } from '../../../mocks/context'
+import { mockContext } from '../../../utils/testing/mocks'
import loadSourceModules from '../../loader'
import type { SourceFiles as Files } from '../../moduleTypes'
import { objectKeys } from '../../../utils/misc'
diff --git a/src/modules/preprocessor/__tests__/linker.ts b/src/modules/preprocessor/__tests__/linker.ts
index 4de464c41..5fd064f92 100644
--- a/src/modules/preprocessor/__tests__/linker.ts
+++ b/src/modules/preprocessor/__tests__/linker.ts
@@ -1,4 +1,4 @@
-import { mockContext } from '../../../mocks/context'
+import { mockContext } from '../../../utils/testing/mocks'
import { MissingSemicolonError } from '../../../parser/errors'
import { Chapter, type Context } from '../../../types'
import { CircularImportError, ModuleNotFoundError } from '../../errors'
diff --git a/src/modules/preprocessor/__tests__/preprocessor.ts b/src/modules/preprocessor/__tests__/preprocessor.ts
index aa6d5d307..4c5c06d28 100644
--- a/src/modules/preprocessor/__tests__/preprocessor.ts
+++ b/src/modules/preprocessor/__tests__/preprocessor.ts
@@ -2,7 +2,7 @@ import type { Program } from 'estree'
import type { MockedFunction } from 'jest-mock'
import { parseError, type IOptions } from '../../..'
-import { mockContext } from '../../../mocks/context'
+import { mockContext } from '../../../utils/testing/mocks'
import { Chapter, type RecursivePartial } from '../../../types'
import { memoizedGetModuleDocsAsync } from '../../loader/loaders'
import preprocessFileImports from '..'
diff --git a/src/modules/preprocessor/__tests__/transformers/hoistAndMergeImports.ts b/src/modules/preprocessor/__tests__/transformers/hoistAndMergeImports.ts
index b86cc64c1..1f8dbbb88 100644
--- a/src/modules/preprocessor/__tests__/transformers/hoistAndMergeImports.ts
+++ b/src/modules/preprocessor/__tests__/transformers/hoistAndMergeImports.ts
@@ -1,4 +1,4 @@
-import { mockContext } from '../../../../mocks/context'
+import { mockContext } from '../../../../utils/testing/mocks'
import { parse } from '../../../../parser/parser'
import { Chapter } from '../../../../types'
import hoistAndMergeImports from '../../transformers/hoistAndMergeImports'
diff --git a/src/modules/preprocessor/__tests__/transformers/removeExports.ts b/src/modules/preprocessor/__tests__/transformers/removeExports.ts
index c53f9fb44..37f252101 100644
--- a/src/modules/preprocessor/__tests__/transformers/removeExports.ts
+++ b/src/modules/preprocessor/__tests__/transformers/removeExports.ts
@@ -1,4 +1,4 @@
-import { mockContext } from '../../../../mocks/context'
+import { mockContext } from '../../../../utils/testing/mocks'
import { parse } from '../../../../parser/parser'
import { Chapter, type Context } from '../../../../types'
import removeExports from '../../transformers/removeExports'
diff --git a/src/modules/preprocessor/__tests__/transformers/transformProgramToFunctionDeclaration.ts b/src/modules/preprocessor/__tests__/transformers/transformProgramToFunctionDeclaration.ts
index 201b0f26d..a5659651b 100644
--- a/src/modules/preprocessor/__tests__/transformers/transformProgramToFunctionDeclaration.ts
+++ b/src/modules/preprocessor/__tests__/transformers/transformProgramToFunctionDeclaration.ts
@@ -1,4 +1,4 @@
-import { mockContext } from '../../../../mocks/context'
+import { mockContext } from '../../../../utils/testing/mocks'
import { parse } from '../../../../parser/parser'
import { defaultExportLookupName } from '../../../../stdlib/localImport.prelude'
import { Chapter } from '../../../../types'
diff --git a/src/name-extractor/__tests__/modules.ts b/src/name-extractor/__tests__/modules.ts
index b9c34da82..3337feb0c 100644
--- a/src/name-extractor/__tests__/modules.ts
+++ b/src/name-extractor/__tests__/modules.ts
@@ -1,13 +1,13 @@
import { DeclarationKind } from '..'
import { getNames } from '../..'
-import { mockContext } from '../../mocks/context'
+import { mockContext } from '../../utils/testing/mocks'
import { Chapter } from '../../types'
import {
memoizedGetModuleDocsAsync,
memoizedGetModuleManifestAsync
} from '../../modules/loader/loaders'
-import { asMockedFunc } from '../../utils/testing'
+import { asMockedFunc } from '../../utils/testing/misc'
import { ModuleConnectionError } from '../../modules/errors'
jest.mock('../../modules/loader/loaders')
diff --git a/src/parser/__tests__/__snapshots__/allowed-syntax.ts.snap b/src/parser/__tests__/__snapshots__/allowed-syntax.ts.snap
index 9f4b9ba4f..74cd75939 100644
--- a/src/parser/__tests__/__snapshots__/allowed-syntax.ts.snap
+++ b/src/parser/__tests__/__snapshots__/allowed-syntax.ts.snap
@@ -1,4633 +1,419399 @@
// Jest Snapshot v1, https://goo.gl/fbAQLP
-exports[`Syntaxes are allowed in the chapter they are introduced 0: parse passes 1`] = `
+exports[`Syntaxes are allowed in the chapter they are introduced 0 1`] = `
Object {
- "alertResult": Array [],
- "code": "parse(\\"\\");",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- "sequence",
- Array [
- null,
- null,
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 1,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ },
+ "evaller": null,
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {},
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [],
+ "end": 0,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 0,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
],
- ],
- "resultStatus": "finished",
- "visualiseListResult": Array [],
-}
-`;
-
-exports[`Syntaxes are allowed in the chapter they are introduced 0: passes 1`] = `
-Object {
- "alertResult": Array [],
- "code": "",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": undefined,
- "resultStatus": "finished",
- "visualiseListResult": Array [],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "arity": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_number": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "stringify": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
+ Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "arity": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_number": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "stringify": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ } => EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "arity": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_number": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "stringify": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ },
+ },
+ "environments": Array [
+ Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "arity": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_number": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "stringify": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ ],
+ "isRunning": false,
+ "nodes": Array [],
+ "objectCount": 0,
+ "stash": null,
+ "transformers": Transformers {
+ "items": Map {},
+ "parent": null,
+ },
+ "value": undefined,
+ },
+ "shouldIncreaseEvaluationTimeout": false,
+ "typeEnvironment": Array [
+ Object {
+ "declKindMap": Map {
+ "Infinity" => "const",
+ "NaN" => "const",
+ "undefined" => "const",
+ "math_E" => "const",
+ "math_LN2" => "const",
+ "math_LN10" => "const",
+ "math_LOG2E" => "const",
+ "math_LOG10E" => "const",
+ "math_PI" => "const",
+ "math_SQRT1_2" => "const",
+ "math_SQRT2" => "const",
+ "is_boolean" => "const",
+ "is_number" => "const",
+ "is_string" => "const",
+ "is_undefined" => "const",
+ "is_function" => "const",
+ "math_abs" => "const",
+ "math_acos" => "const",
+ "math_acosh" => "const",
+ "math_asin" => "const",
+ "math_asinh" => "const",
+ "math_atan" => "const",
+ "math_atan2" => "const",
+ "math_atanh" => "const",
+ "math_cbrt" => "const",
+ "math_ceil" => "const",
+ "math_clz32" => "const",
+ "math_cos" => "const",
+ "math_cosh" => "const",
+ "math_exp" => "const",
+ "math_expm1" => "const",
+ "math_floor" => "const",
+ "math_fround" => "const",
+ "math_hypot" => "const",
+ "math_imul" => "const",
+ "math_log" => "const",
+ "math_log1p" => "const",
+ "math_log2" => "const",
+ "math_log10" => "const",
+ "math_max" => "const",
+ "math_min" => "const",
+ "math_pow" => "const",
+ "math_random" => "const",
+ "math_round" => "const",
+ "math_sign" => "const",
+ "math_sin" => "const",
+ "math_sinh" => "const",
+ "math_sqrt" => "const",
+ "math_tan" => "const",
+ "math_tanh" => "const",
+ "math_trunc" => "const",
+ "parse_int" => "const",
+ "prompt" => "const",
+ "get_time" => "const",
+ "stringify" => "const",
+ "display" => "const",
+ "error" => "const",
+ "-_1" => "const",
+ "!" => "const",
+ "&&" => "const",
+ "||" => "const",
+ "<" => "const",
+ "<=" => "const",
+ ">" => "const",
+ ">=" => "const",
+ "+" => "const",
+ "%" => "const",
+ "-" => "const",
+ "*" => "const",
+ "/" => "const",
+ "===" => "const",
+ "!==" => "const",
+ "raw_display" => "const",
+ "char_at" => "const",
+ "arity" => "const",
+ },
+ "typeAliasMap": Map {},
+ "typeMap": Map {
+ "Infinity" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": Infinity,
+ },
+ "NaN" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": NaN,
+ },
+ "undefined" => Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ "math_E" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": 2.718281828459045,
+ },
+ "math_LN2" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": 0.6931471805599453,
+ },
+ "math_LN10" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": 2.302585092994046,
+ },
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+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_expm1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_floor" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_fround" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_hypot" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_imul" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log1p" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log10" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
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+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
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+ "name": "boolean",
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+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
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+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ ],
+ "returnType": Object {
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+ "value": undefined,
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+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ "name": "A",
+ },
+ ],
+ "returnType": Object {
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+ },
+ },
+ "typeParams": undefined,
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+ ">=" => Object {
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+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
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+ "constraint": "addable",
+ "kind": "variable",
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+ },
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+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
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+ "kind": "variable",
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+ "kind": "variable",
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+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
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+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
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+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
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+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
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+ "name": "boolean",
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+ "typeParams": undefined,
+ },
+ "!==" => Object {
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+ "constraint": "addable",
+ "kind": "variable",
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+ "returnType": Object {
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+ },
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+ },
+ "raw_display" => Object {
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+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
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+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": undefined,
+ },
}
`;
-exports[`Syntaxes are allowed in the chapter they are introduced 1: parse passes 1`] = `
+exports[`Syntaxes are allowed in the chapter they are introduced 0 2`] = `
Object {
- "alertResult": Array [],
- "code": "parse(\\"function name(a, b) {\\\\n const sum = a + b;\\\\n if (sum > 1) {\\\\n return sum;\\\\n } else {\\\\n if (a % 2 === 0) {\\\\n return -1;\\\\n } else if (b % 2 === 0) {\\\\n return 1;\\\\n } else {\\\\n return a > b ? 0 : -2;\\\\n }\\\\n }\\\\n}\\\\nname(1, 2);\\");",
- "displayResult": Array [],
- "numErrors": 0,
- "parsedErrors": "",
- "result": Array [
- "sequence",
- Array [
- Array [
- Array [
- "function_declaration",
- Array [
- Array [
- "name",
- Array [
- "name",
- null,
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 10,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 8,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 8,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "",
+ },
],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 9,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 9,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
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+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
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+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "sequence",
+ Array [
+ null,
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 1 1`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 1,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
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+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_atan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_atan2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_atanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_cbrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_ceil" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_clz32" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_cos" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_cosh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_exp" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_expm1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_floor" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_fround" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_hypot" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_imul" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log1p" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log10" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
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+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
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+ "name": "boolean",
+ "value": undefined,
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+ ],
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+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ "kind": "variable",
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+ ],
+ "returnType": Object {
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+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "function name(a, b) {
+ const sum = a + b;
+ if (sum > 1) {
+ return sum;
+ } else {
+ if (a % 2 === 0) {
+ return -1;
+ } else if (b % 2 === 0) {
+ return 1;
+ } else {
+ return a > b ? 0 : -2;
+ }
+ }
+}
+name(1, 2);",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 3,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 1 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
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+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"function name(a, b) {\\\\n const sum = a + b;\\\\n if (sum > 1) {\\\\n return sum;\\\\n } else {\\\\n if (a % 2 === 0) {\\\\n return -1;\\\\n } else if (b % 2 === 0) {\\\\n return 1;\\\\n } else {\\\\n return a > b ? 0 : -2;\\\\n }\\\\n }\\\\n}\\\\nname(1, 2);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
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+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"function name(a, b) {\\\\n const sum = a + b;\\\\n if (sum > 1) {\\\\n return sum;\\\\n } else {\\\\n if (a % 2 === 0) {\\\\n return -1;\\\\n } else if (b % 2 === 0) {\\\\n return 1;\\\\n } else {\\\\n return a > b ? 0 : -2;\\\\n }\\\\n }\\\\n}\\\\nname(1, 2);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
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+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_atan2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_atanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_cbrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_ceil" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_clz32" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_cos" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_cosh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_exp" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_expm1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_floor" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_fround" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_hypot" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_imul" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log1p" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log10" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "(() => true)();",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": true,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 2 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
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+ "returnType": Object {
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+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"(() => true)();\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
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+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"(() => true)();\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "application",
+ Array [
+ Array [
+ "lambda_expression",
+ Array [
+ null,
+ Array [
+ Array [
+ "return_statement",
+ Array [
+ Array [
+ "literal",
+ Array [
+ true,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ null,
+ null,
+ ],
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 3 1`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 1,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
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+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_exp" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_expm1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_floor" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_fround" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_hypot" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_imul" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log1p" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log10" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
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+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
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+ "typeParams": undefined,
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+ "display" => Object {
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+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
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+ "typeParams": undefined,
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+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
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+ "name": "number",
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+ "name": "number",
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+ "returnType": Object {
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+ "returnType": Object {
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+ "*" => Object {
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+ Object {
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+ "returnType": Object {
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+ "/" => Object {
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+ "returnType": Object {
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+ "===" => Object {
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+ "polyType": Object {
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+ "returnType": Object {
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+ "polyType": Object {
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+ "kind": "variable",
+ "name": "T1",
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+ "char_at" => Object {
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+ "kind": "variable",
+ "name": "T1",
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+ "arity" => Object {
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+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
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+ "typeParams": undefined,
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+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
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+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 3,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 3 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
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+ "externalContext": undefined,
+ "externalSymbols": Array [],
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+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
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+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
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+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
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+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
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+ "filter",
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+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
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+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"((x, y) => { return x + y; })(1, 2);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 46,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 44,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 44,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
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+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"((x, y) => { return x + y; })(1, 2);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "application",
+ Array [
+ Array [
+ "lambda_expression",
+ Array [
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "name",
+ Array [
+ "y",
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "return_statement",
+ Array [
+ Array [
+ "binary_operator_combination",
+ Array [
+ "+",
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "name",
+ Array [
+ "y",
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 2,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 4 1`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 1,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
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+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"true;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
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+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
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+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
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+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
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+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
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+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
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+ Node {
+ "end": 15,
+ "expression": Node {
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+ Node {
+ "end": 13,
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+ "end": Position {
+ "column": 13,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"true;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "true;",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
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+ "loc": SourceLocation {
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+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
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+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
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+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 15,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 15,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
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+ "apply_in_underlying_javascript": [Function],
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+ "array_length": [Function],
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+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
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+ "stream": [Function],
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+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
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+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
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+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"true;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "literal",
+ Array [
+ true,
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 5 1`] = `
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+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"false;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
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+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"false;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
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+}
+
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+// Lazy? Sort-of: eval_stream only forces the computation of
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+function stream_ref(s, n) {
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+}
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+}
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+ "returnType": Object {
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+ "value": undefined,
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+ "name": "number",
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+
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+ "value": undefined,
+ },
+ },
+ "math_log1p" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log10" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"'a string \\\\\\"\\\\\\" \\\\\\\\'\\\\\\\\'';\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 33,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 31,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 31,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"'a string \\\\\\"\\\\\\" \\\\\\\\'\\\\\\\\'';\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "'a string \\"\\" \\\\'\\\\'';",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 32,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 32,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 33,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 33,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 33,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
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+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_hypot" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_imul" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log1p" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log10" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"'a string \\\\\\"\\\\\\" \\\\\\\\'\\\\\\\\'';\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "literal",
+ Array [
+ "a string \\"\\" ''",
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 7 1`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 1,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {},
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
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+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"31.4 + (-3.14e10) * -1 % 2 / 1.5;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 43,
+ "expression": Node {
+ "arguments": Array [
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+ "loc": SourceLocation {
+ "end": Position {
+ "column": 41,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"31.4 + (-3.14e10) * -1 % 2 / 1.5;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "31.4 + (-3.14e10) * -1 % 2 / 1.5;",
+ },
+ ],
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+ "end": 5,
+ "loc": SourceLocation {
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+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
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+ "line": 1,
+ },
+ },
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+ "start": 0,
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+ },
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+ },
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+ },
+ "start": Position {
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+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 43,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 43,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
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+ "is_function": [Function],
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+ "is_null": [Function],
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+ "math_PI": 3.141592653589793,
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+ "math_ceil": [Function],
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+ "math_exp": [Function],
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+ "stream": [Function],
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+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
+ Object {
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+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
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+ "math_acos": [Function],
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+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"31.4 + (-3.14e10) * -1 % 2 / 1.5;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 8 1`] = `
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+ "prelude": null,
+ "previousPrograms": Array [
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+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_expm1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_floor" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_fround" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_hypot" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_imul" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log1p" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log10" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
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+ },
+ ],
+ "returnType": Object {
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+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
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+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
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+ Object {
+ "constraint": "addable",
+ "kind": "variable",
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+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
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+ "name": "A",
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+ ],
+ "returnType": Object {
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+ "value": undefined,
+ },
+ },
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+ "polyType": Object {
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+ "kind": "variable",
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+ "kind": "variable",
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+ ],
+ "returnType": Object {
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+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
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+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
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+ "kind": "variable",
+ "name": "A",
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+ },
+ ],
+ "returnType": Object {
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+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
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+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ "kind": "variable",
+ "name": "A",
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+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "1 === 1 && 1 < 2 && 1 <= 2 && 2 >= 1 && 2 > 1 || false;",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": true,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 8 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 65,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 63,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 63,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"1 === 1 && 1 < 2 && 1 <= 2 && 2 >= 1 && 2 > 1 || false;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "1 === 1 && 1 < 2 && 1 <= 2 && 2 >= 1 && 2 > 1 || false;",
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+ ],
+ "callee": Node {
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+ "loc": SourceLocation {
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+ "line": 1,
+ },
+ "start": Position {
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+ "line": 1,
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+ "name": "parse",
+ "start": 0,
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+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"1 === 1 && 1 < 2 && 1 <= 2 && 2 >= 1 && 2 > 1 || false;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 65,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 63,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 63,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
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+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"1 === 1 && 1 < 2 && 1 <= 2 && 2 >= 1 && 2 > 1 || false;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "logical_composition",
+ Array [
+ "||",
+ Array [
+ Array [
+ "logical_composition",
+ Array [
+ "&&",
+ Array [
+ Array [
+ "logical_composition",
+ Array [
+ "&&",
+ Array [
+ Array [
+ "logical_composition",
+ Array [
+ "&&",
+ Array [
+ Array [
+ "logical_composition",
+ Array [
+ "&&",
+ Array [
+ Array [
+ "binary_operator_combination",
+ Array [
+ "===",
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "binary_operator_combination",
+ Array [
+ "<",
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 2,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "binary_operator_combination",
+ Array [
+ "<=",
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 2,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "binary_operator_combination",
+ Array [
+ ">=",
+ Array [
+ Array [
+ "literal",
+ Array [
+ 2,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "binary_operator_combination",
+ Array [
+ ">",
+ Array [
+ Array [
+ "literal",
+ Array [
+ 2,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ false,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 9 1`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 1,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
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+ "value": undefined,
+ },
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+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
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+ "value": undefined,
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+ "returnType": Object {
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+ "value": undefined,
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+ "parameterTypes": Array [
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+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
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+}
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+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"true ? 1 : 2;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 23,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 21,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 21,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"true ? 1 : 2;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "true ? 1 : 2;",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 22,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 22,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 23,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 23,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 23,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "pair": [Function],
+ "parse": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "set_head": [Function],
+ "set_tail": [Function],
+ "stream": [Function],
+ "stringify": [Function],
+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
+ Object {
+ "head": Object {
+ "Infinity": Infinity,
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+ "value": undefined,
+ },
+ },
+ "math_log1p" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log10" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"true ? 1 : 2;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "conditional_expression",
+ Array [
+ Array [
+ "literal",
+ Array [
+ true,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 2,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 10 1`] = `"Line 1: null literals are not allowed."`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 10 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 2,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 5,
+ "expression": Node {
+ "end": 4,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 4,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "raw": "null",
+ "start": 0,
+ "type": "Literal",
+ "value": null,
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "arity": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
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+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
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+ "math_PI": 3.141592653589793,
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+ "math_atanh": [Function],
+ "math_cbrt": [Function],
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+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
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+ "math_floor": [Function],
+ "math_fround": [Function],
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+ "math_imul": [Function],
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+ "math_log1p": [Function],
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+ "math_min": [Function],
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+ "math_random": [Function],
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+ "pair": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "stringify": [Function],
+ "tail": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
+ Object {
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+ "Infinity": Infinity,
+ "NaN": NaN,
+ "arity": [Function],
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+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "null;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
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+}
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+function accumulate(f, initial, xs) {
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+}
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+function __access_named_export__(named_exports, lookup_name) {
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+}
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+function __access_export__(exports, lookup_name) {
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+ } else {
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+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
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+ "start": Position {
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+ "control": null,
+ "debuggerOn": true,
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+ "envStepsTotal": 0,
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+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "null;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": null,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 10 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 15,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 13,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 13,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"null;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "null;",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 14,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 14,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 15,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 15,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 15,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "pair": [Function],
+ "parse": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "set_head": [Function],
+ "set_tail": [Function],
+ "stream": [Function],
+ "stringify": [Function],
+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
+ Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "pair": [Function],
+ "parse": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "set_head": [Function],
+ "set_tail": [Function],
+ "stream": [Function],
+ "stringify": [Function],
+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
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+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"null;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 15,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 13,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 13,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"null;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "null;",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 14,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 14,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 15,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 15,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 15,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
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+ "prompt": [Function],
+ "raw_display": [Function],
+ "set_head": [Function],
+ "set_tail": [Function],
+ "stream": [Function],
+ "stringify": [Function],
+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
+ Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
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+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
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+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"null;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "literal",
+ Array [
+ null,
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 11 1`] = `"Line 1: null literals are not allowed."`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 11 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 2,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 14,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 6,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 6,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 5,
+ "line": 1,
+ },
+ },
+ "raw": "1",
+ "start": 5,
+ "type": "Literal",
+ "value": 1,
+ },
+ Node {
+ "end": 12,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 12,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 8,
+ "line": 1,
+ },
+ },
+ "raw": "null",
+ "start": 8,
+ "type": "Literal",
+ "value": null,
+ },
+ ],
+ "callee": Node {
+ "end": 4,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 4,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "pair",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 13,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 13,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 14,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 14,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 14,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "arity": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
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+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
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+ "math_acos": [Function],
+ "math_acosh": [Function],
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+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
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+ "math_cosh": [Function],
+ "math_exp": [Function],
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+ "prompt": [Function],
+ "raw_display": [Function],
+ "stringify": [Function],
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+ "undefined": undefined,
+ },
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+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
+ Object {
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+ "Infinity": Infinity,
+ "NaN": NaN,
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+ "math_acosh": [Function],
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+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "pair(1, null);",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
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+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "pair(1, null);",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ 1,
+ null,
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 11 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 24,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 22,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 22,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"pair(1, null);\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "pair(1, null);",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 23,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 23,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 24,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 24,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 24,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "pair": [Function],
+ "parse": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "set_head": [Function],
+ "set_tail": [Function],
+ "stream": [Function],
+ "stringify": [Function],
+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
+ Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "pair": [Function],
+ "parse": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "set_head": [Function],
+ "set_tail": [Function],
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+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"pair(1, null);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 24,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 22,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 22,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"pair(1, null);\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "pair(1, null);",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 23,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 23,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 24,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 24,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 24,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "pair": [Function],
+ "parse": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "set_head": [Function],
+ "set_tail": [Function],
+ "stream": [Function],
+ "stringify": [Function],
+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
+ Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
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+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
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+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"pair(1, null);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "application",
+ Array [
+ Array [
+ "name",
+ Array [
+ "pair",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ null,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 12 1`] = `"Line 1: Name list not declared."`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 12 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 2,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 8,
+ "expression": Node {
+ "arguments": Array [
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+ "line": 1,
+ },
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+ },
+ },
+ "raw": "1",
+ "start": 5,
+ "type": "Literal",
+ "value": 1,
+ },
+ ],
+ "callee": Node {
+ "end": 4,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 4,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "list",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 7,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 7,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
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+ "loc": SourceLocation {
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+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
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+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 8,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 8,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
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+ "prompt": [Function],
+ "raw_display": [Function],
+ "stringify": [Function],
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+ "undefined": undefined,
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+ "storage": null,
+ },
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+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
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+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "list(1);",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
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+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "list(1);",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ 1,
+ null,
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 12 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 18,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 16,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 16,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"list(1);\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "list(1);",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 17,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 17,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 18,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 18,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 18,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "pair": [Function],
+ "parse": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "set_head": [Function],
+ "set_tail": [Function],
+ "stream": [Function],
+ "stringify": [Function],
+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
+ Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
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+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "pair": [Function],
+ "parse": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "set_head": [Function],
+ "set_tail": [Function],
+ "stream": [Function],
+ "stringify": [Function],
+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
+ },
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+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"list(1);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 18,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 16,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 16,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"list(1);\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "list(1);",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 17,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 17,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 18,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 18,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 18,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "pair": [Function],
+ "parse": [Function],
+ "parse_int": [Function],
+ "prompt": [Function],
+ "raw_display": [Function],
+ "set_head": [Function],
+ "set_tail": [Function],
+ "stream": [Function],
+ "stringify": [Function],
+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
+ Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
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+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
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+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"list(1);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "application",
+ Array [
+ Array [
+ "name",
+ Array [
+ "list",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ null,
+ ],
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 13 1`] = `"Line 1: Export named declarations are not allowed"`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 13 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 2,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
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+ "executionMethod": "native",
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+ "externalSymbols": Array [],
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+ "display" => [Function],
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+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
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+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
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+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
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+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
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+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "export function f(x) {
+ return x;
+}
+f(5);",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
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+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "export function f(x) {
+ return x;
+}
+f(5);",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 5,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 13 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 55,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 53,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 53,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"export function f(x) {\\\\n return x;\\\\n}\\\\nf(5);\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "export function f(x) {
+ return x;
+}
+f(5);",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 54,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 54,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 55,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 55,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 55,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
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+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"export function f(x) {\\\\n return x;\\\\n}\\\\nf(5);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 55,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 53,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 53,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"export function f(x) {\\\\n return x;\\\\n}\\\\nf(5);\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "export function f(x) {
+ return x;
+}
+f(5);",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 54,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 54,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
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+ },
+ },
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+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
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+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 55,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 55,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
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+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"export function f(x) {\\\\n return x;\\\\n}\\\\nf(5);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "sequence",
+ Array [
+ Array [
+ Array [
+ "export_named_declaration",
+ Array [
+ Array [
+ "function_declaration",
+ Array [
+ Array [
+ "name",
+ Array [
+ "f",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ null,
+ ],
+ Array [
+ Array [
+ "return_statement",
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "application",
+ Array [
+ Array [
+ "name",
+ Array [
+ "f",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ Array [
+ "literal",
+ Array [
+ 5,
+ null,
+ ],
+ ],
+ null,
+ ],
+ null,
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 14 1`] = `"Line 1: Export named declarations are not allowed"`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 14 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 2,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "x",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "declarations": Array [
+ Node {
+ "end": 18,
+ "id": Node {
+ "end": 14,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 14,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 13,
+ "line": 1,
+ },
+ },
+ "name": "x",
+ "start": 13,
+ "type": "Identifier",
+ },
+ "init": Node {
+ "end": 18,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 18,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 17,
+ "line": 1,
+ },
+ },
+ "raw": "1",
+ "start": 17,
+ "type": "Literal",
+ "value": 1,
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 18,
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+ "math_cosh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_exp" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_expm1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_floor" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_fround" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_hypot" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_imul" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log1p" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log10" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "export const x = 1;
+x;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
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+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "export const x = 1;
+x;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 1,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 14 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 33,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 31,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 31,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"export const x = 1;\\\\nx;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "export const x = 1;
+x;",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 32,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 32,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 33,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 33,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 33,
+ "line": 1,
+ },
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+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"export const x = 1;\\\\nx;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 33,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 31,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 31,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"export const x = 1;\\\\nx;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "export const x = 1;
+x;",
+ },
+ ],
+ "callee": Node {
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+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"export const x = 1;\\\\nx;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "sequence",
+ Array [
+ Array [
+ Array [
+ "export_named_declaration",
+ Array [
+ Array [
+ "constant_declaration",
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 15 1`] = `
+"Line 1: Mutable variable declaration using keyword 'let' is not allowed.
+Line 3: Assignment expressions are not allowed
+Line 2: While statements are not allowed"
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 15 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 3,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
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+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let i = 1;
+while (i < 5) {
+ i = i + 1;
+}
+i;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 3,
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+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let i = 1;
+while (i < 5) {
+ i = i + 1;
+}
+i;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 5,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 15 3`] = `
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+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let i = 1;\\\\nwhile (i < 5) {\\\\n i = i + 1;\\\\n}\\\\ni;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let i = 1;\\\\nwhile (i < 5) {\\\\n i = i + 1;\\\\n}\\\\ni;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "sequence",
+ Array [
+ Array [
+ Array [
+ "variable_declaration",
+ Array [
+ Array [
+ "name",
+ Array [
+ "i",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "while_loop",
+ Array [
+ Array [
+ "binary_operator_combination",
+ Array [
+ "<",
+ Array [
+ Array [
+ "name",
+ Array [
+ "i",
+ null,
+ ],
+ ],
+ Array [
+ Array [
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+ Array [
+ 5,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "assignment",
+ Array [
+ Array [
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+ Array [
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+ null,
+ ],
+ ],
+ Array [
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+ Array [
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+ Array [
+ Array [
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+ Array [
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+ null,
+ ],
+ ],
+ Array [
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+ ],
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+ ],
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+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
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+ Array [
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+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 16 1`] = `
+"Line 1: Mutable variable declaration using keyword 'let' is not allowed.
+Line 2: Assignment expressions are not allowed
+Line 2: Assignment expressions are not allowed
+Line 2: For statements are not allowed"
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 16 2`] = `
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+ "alertResult": Array [],
+ "chapter": 3,
+ "debugger": Object {
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+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
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+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
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+ "list_to_string",
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+ "remove_all",
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+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let i = 1;
+for (i = 1; i < 5; i = i + 1) {
+}
+i;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 3,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
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+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
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+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
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+ "math_SQRT2" => 1.4142135623730951,
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+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
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+ "evaluateBinaryExpression" => [Function],
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+ "wrap" => [Function],
+ "setProp" => [Function],
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+ },
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+ "enum_list",
+ "list_ref",
+ "$accumulate",
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+ "is_stream",
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+ "stream_to_list",
+ "stream_length",
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+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
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+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
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+ "i",
+ "startTime",
+ },
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+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let i = 1;
+for (i = 1; i < 5; i = i + 1) {
+}
+i;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 5,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 16 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 60,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 58,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 58,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"let i = 1;\\\\nfor (i = 1; i < 5; i = i + 1) {\\\\n}\\\\ni;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "let i = 1;
+for (i = 1; i < 5; i = i + 1) {
+}
+i;",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 59,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 59,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 60,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 60,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 60,
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+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let i = 1;\\\\nfor (i = 1; i < 5; i = i + 1) {\\\\n}\\\\ni;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 60,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 58,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 58,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"let i = 1;\\\\nfor (i = 1; i < 5; i = i + 1) {\\\\n}\\\\ni;\\"",
+ "start": 6,
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+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let i = 1;\\\\nfor (i = 1; i < 5; i = i + 1) {\\\\n}\\\\ni;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "sequence",
+ Array [
+ Array [
+ Array [
+ "variable_declaration",
+ Array [
+ Array [
+ "name",
+ Array [
+ "i",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "for_loop",
+ Array [
+ Array [
+ "assignment",
+ Array [
+ Array [
+ "name",
+ Array [
+ "i",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "binary_operator_combination",
+ Array [
+ "<",
+ Array [
+ Array [
+ "name",
+ Array [
+ "i",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 5,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "assignment",
+ Array [
+ Array [
+ "name",
+ Array [
+ "i",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "binary_operator_combination",
+ Array [
+ "+",
+ Array [
+ Array [
+ "name",
+ Array [
+ "i",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "sequence",
+ Array [
+ null,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "name",
+ Array [
+ "i",
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 17 1`] = `
+"Line 1: Mutable variable declaration using keyword 'let' is not allowed.
+Line 2: Mutable variable declaration using keyword 'let' is not allowed.
+Line 2: Assignment expressions are not allowed
+Line 4: Continue statements are not allowed
+Line 6: Assignment expressions are not allowed
+Line 8: Break statements are not allowed
+Line 7: Missing \\"else\\" in \\"if-else\\" statement.
+Line 2: For statements are not allowed"
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 17 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 3,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
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+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let i = 1;
+for (let j = 0; j < 5; j = j + 1) {
+ if (j < 1) {
+ continue;
+ } else {
+ i = i + 1;
+ if (j > 2) {
+ break;
+ }
+ }
+}
+i;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 3,
+ "debugger": Object {
+ "observers": Object {
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+ },
+ "state": Object {
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+ },
+ "status": false,
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+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let i = 1;
+for (let j = 0; j < 5; j = j + 1) {
+ if (j < 1) {
+ continue;
+ } else {
+ i = i + 1;
+ if (j > 2) {
+ break;
+ }
+ }
+}
+i;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 4,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 17 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
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+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let i = 1;\\\\nfor (let j = 0; j < 5; j = j + 1) {\\\\n if (j < 1) {\\\\n continue;\\\\n } else {\\\\n i = i + 1;\\\\n if (j > 2) {\\\\n break;\\\\n }\\\\n }\\\\n}\\\\ni;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
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+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let i = 1;\\\\nfor (let j = 0; j < 5; j = j + 1) {\\\\n if (j < 1) {\\\\n continue;\\\\n } else {\\\\n i = i + 1;\\\\n if (j > 2) {\\\\n break;\\\\n }\\\\n }\\\\n}\\\\ni;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
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+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "[];",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "[];",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 18 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
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+ "math_asinh" => [Function],
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+ "math_atanh" => [Function],
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+ "math_log" => [Function],
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+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
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+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
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+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
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+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
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+ },
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+ "line": 1,
+ },
+ },
+ "raw": "\\"[];\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "[];",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 12,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 12,
+ "line": 1,
+ },
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+ },
+ },
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+ },
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+ },
+ },
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+ "type": "ExpressionStatement",
+ },
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+ "end": 13,
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+ "end": Position {
+ "column": 13,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
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+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
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+ },
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+ "name": "global",
+ "tail": null,
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+ "parent": null,
+ },
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+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
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+ "undefined": undefined,
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+ "storage": null,
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+ "id": "-1",
+ "name": "global",
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+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"[];\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
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+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
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+ "stream_reverse",
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+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"[];\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "array_expression",
+ Array [
+ null,
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 19 1`] = `"Line 1: Array expressions are not allowed"`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 19 2`] = `
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+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "[1, 2, 3];",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "[1, 2, 3];",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ 1,
+ 2,
+ 3,
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 19 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
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+ "externalSymbols": Array [],
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+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
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+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
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+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
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+ "line": 1,
+ },
+ },
+ "raw": "\\"[1, 2, 3];\\"",
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+ "type": "Literal",
+ "value": "[1, 2, 3];",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 19,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 19,
+ "line": 1,
+ },
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+ },
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+ },
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+ "end": Position {
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+ },
+ "start": Position {
+ "column": 0,
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+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
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+ ],
+ "promptResult": Array [],
+ "runtime": Object {
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+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
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+ "parent": null,
+ },
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+ "apply_in_underlying_javascript": [Function],
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+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"[1, 2, 3];\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+ ],
+ "variant": "default",
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+ "chapter": 4,
+ "debugger": Object {
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+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"[1, 2, 3];\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "array_expression",
+ Array [
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 2,
+ null,
+ ],
+ ],
+ Array [
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+ Array [
+ 3,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 20 1`] = `
+"Line 1: Array expressions are not allowed
+Line 1: Member expressions are not allowed"
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 20 2`] = `
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+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "[1, 2, 3][1];",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "[1, 2, 3][1];",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 2,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 20 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
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+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
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+ "executionMethod": "native",
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+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
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+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
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+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
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+ },
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+ },
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+ "start": 0,
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+ },
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+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
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+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"[1, 2, 3][1];\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
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+ "is_undefined" => [Function],
+ "parse_int" => [Function],
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+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
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+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
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+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
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+ Node {
+ "end": 23,
+ "expression": Node {
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+ "end": 21,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 21,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"[1, 2, 3][1];\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "[1, 2, 3][1];",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 22,
+ "loc": SourceLocation {
+ "end": Position {
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+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 23,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 23,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 23,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
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+ "undefined": undefined,
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+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
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+ "NaN": NaN,
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+ "set_head": [Function],
+ "set_tail": [Function],
+ "stream": [Function],
+ "stringify": [Function],
+ "tail": [Function],
+ "tokenize": [Function],
+ "undefined": undefined,
+ },
+ "heap": Heap {
+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
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+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"[1, 2, 3][1];\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "object_access",
+ Array [
+ Array [
+ "array_expression",
+ Array [
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 2,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 3,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 21 1`] = `
+"Line 1: Array expressions are not allowed
+Line 1: Mutable variable declaration using keyword 'let' is not allowed.
+Line 2: Member expressions are not allowed"
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 21 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 3,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
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+ "display" => [Function],
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+ "math_asinh" => [Function],
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+ "math_hypot" => [Function],
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+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
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+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
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+ "math_LN10" => 2.302585092994046,
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+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
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+ "tail" => [Function],
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+ "draw_data" => [Function],
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+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ "x",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
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+ "prompt": [Function],
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+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log2" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_log10" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_max" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_min" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "math_pow" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_random" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let x = [1, 2, 3];
+x[1];",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+ "variant": "default",
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+ },
+ "result": Object {
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+ "chapter": 3,
+ "debugger": Object {
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+ "kind": "variable",
+ "name": "T",
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+ },
+ "kind": "list",
+ "typeAsPair": undefined,
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+ },
+ "kind": "predicate",
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+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
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+ },
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+ "typeAsPair": undefined,
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+ "kind": "predicate",
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+ "list" => Object {
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+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
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+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
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+ Object {
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+ "kind": "variable",
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+ "returnType": Object {
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+ "kind": "variable",
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+ "kind": "variable",
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+ "returnType": Object {
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+ "value": undefined,
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+ "set_head" => Object {
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+ "polyType": Object {
+ "kind": "function",
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+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
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+ "kind": "variable",
+ "name": "tailType",
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+ Object {
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+ "kind": "variable",
+ "name": "headType",
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+ "name": "headType",
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+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
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+ "kind": "predicate",
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+ "array_length" => Object {
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+ "kind": "function",
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+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
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+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
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+ "polyType": Object {
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+ "kind": "variable",
+ "name": "T1",
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+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let x = [1, 2, 3];
+x[1];",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 2,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 21 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 35,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 33,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 33,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"let x = [1, 2, 3];\\\\nx[1];\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "let x = [1, 2, 3];
+x[1];",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 34,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 34,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 35,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 35,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 35,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
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+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let x = [1, 2, 3];\\\\nx[1];\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 35,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 33,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 33,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"let x = [1, 2, 3];\\\\nx[1];\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "let x = [1, 2, 3];
+x[1];",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 34,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 34,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 35,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 35,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 35,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
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+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let x = [1, 2, 3];\\\\nx[1];\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "sequence",
+ Array [
+ Array [
+ Array [
+ "variable_declaration",
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "array_expression",
+ Array [
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 2,
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 3,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "object_access",
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 22 1`] = `
+"Line 1: Array expressions are not allowed
+Line 1: Mutable variable declaration using keyword 'let' is not allowed.
+Line 2: Member expressions are not allowed
+Line 2: Assignment expressions are not allowed"
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 22 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 3,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
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+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let x = [1, 2, 3];
+x[1] = 4;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 3,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
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+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let x = [1, 2, 3];
+x[1] = 4;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 4,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 22 3`] = `
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+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
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+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
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+ "externalSymbols": Array [],
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+ "NaN" => NaN,
+ "Infinity" => Infinity,
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+ "math_asin" => [Function],
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+ "loadedModules": Object {},
+ "maxExecTime": 1000,
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+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
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+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
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+ "append",
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+ "enum_list",
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+ "__access_export__",
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+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
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+ "end": 39,
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+ "line": 1,
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+ "line": 1,
+ },
+ },
+ "raw": "\\"let x = [1, 2, 3];\\\\nx[1] = 4;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "let x = [1, 2, 3];
+x[1] = 4;",
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+ ],
+ "callee": Node {
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+ "line": 1,
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+ "line": 1,
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+ "start": 0,
+ "type": "Identifier",
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+ "end": 38,
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+ "end": Position {
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+ "line": 1,
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+ "line": 1,
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+ "line": 1,
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+ "start": Position {
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+ "line": 1,
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+ "start": 0,
+ "type": "ExpressionStatement",
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+ "end": 39,
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+ "line": 1,
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+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
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+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
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+ "environment": Object {
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+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let x = [1, 2, 3];\\\\nx[1] = 4;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
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+// each next element
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+}
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+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let x = [1, 2, 3];\\\\nx[1] = 4;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
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+ Array [
+ Array [
+ Array [
+ "variable_declaration",
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "array_expression",
+ Array [
+ Array [
+ Array [
+ "literal",
+ Array [
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+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 2,
+ null,
+ ],
+ ],
+ Array [
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+ Array [
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+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "object_assignment",
+ Array [
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+ Array [
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+ Array [
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+ null,
+ ],
+ ],
+ Array [
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+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
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+ ],
+ null,
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 23 1`] = `
+"Line 1: Mutable variable declaration using keyword 'let' is not allowed.
+Line 2: Mutable variable declaration using keyword 'let' is not allowed.
+Line 3: Mutable variable declaration using keyword 'let' is not allowed.
+Line 4: Assignment expressions are not allowed
+Line 4: Assignment expressions are not allowed
+Line 4: Assignment expressions are not allowed"
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 23 2`] = `
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+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let x = 3;
+let y = 4;
+let z = 5;
+x = y = z = 6;
+x;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+ "returnType": Object {
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+ "name": "number",
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+ "returnType": Object {
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+ "name": "number",
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+ "math_log" => Object {
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+ "returnType": Object {
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+ "returnType": Object {
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+ "value": undefined,
+ },
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+ "returnType": Object {
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+ "value": undefined,
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+ "returnType": Object {
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+ "value": undefined,
+ },
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+ "value": undefined,
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+ "returnType": Object {
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+ "name": "number",
+ "value": undefined,
+ },
+ },
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+ "value": undefined,
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+ "returnType": Object {
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+ "value": undefined,
+ },
+ },
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+ "value": undefined,
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+ Object {
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+ "returnType": Object {
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+ "value": undefined,
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+ "prompt" => Object {
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+ "parameterTypes": Array [
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+ ],
+ "returnType": Object {
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+ "value": undefined,
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+ "parameterTypes": Array [],
+ "returnType": Object {
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+ },
+ },
+ "stringify" => Object {
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+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
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+ "name": "string",
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+ "kind": "forall",
+ "polyType": Object {
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+ "kind": "variable",
+ "name": "T",
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+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
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+ "kind": "variable",
+ "name": "T",
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+ "typeParams": undefined,
+ },
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+ "kind": "variable",
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+ "kind": "forall",
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+ "kind": "variable",
+ "name": "A",
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+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
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+ },
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+ },
+ ">=" => Object {
+ "kind": "forall",
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+ "kind": "function",
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+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
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+ ],
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+ "name": "boolean",
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+ "kind": "variable",
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+ "returnType": Object {
+ "constraint": "addable",
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+ "name": "A",
+ },
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+ Object {
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+ "value": undefined,
+ },
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+ "returnType": Object {
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+ "returnType": Object {
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+ "name": "number",
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+ "returnType": Object {
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+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
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+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
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+ "returnType": Object {
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+ "kind": "variable",
+ "name": "headType",
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+ "kind": "pair",
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+ "kind": "variable",
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+ },
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+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
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+ "kind": "variable",
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+ "kind": "pair",
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+ "kind": "variable",
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+ "kind": "variable",
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+ "tail" => Object {
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+ "kind": "predicate",
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+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
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+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
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+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
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+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
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+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "let x = 3;
+let y = 4;
+let z = 5;
+x = y = z = 6;
+x;",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 6,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 23 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 64,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 62,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 62,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"let x = 3;\\\\nlet y = 4;\\\\nlet z = 5;\\\\nx = y = z = 6;\\\\nx;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "let x = 3;
+let y = 4;
+let z = 5;
+x = y = z = 6;
+x;",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 63,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 63,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 64,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 64,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 64,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "head": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
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+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let x = 3;\\\\nlet y = 4;\\\\nlet z = 5;\\\\nx = y = z = 6;\\\\nx;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 4,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 64,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 62,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 62,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"let x = 3;\\\\nlet y = 4;\\\\nlet z = 5;\\\\nx = y = z = 6;\\\\nx;\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "let x = 3;
+let y = 4;
+let z = 5;
+x = y = z = 6;
+x;",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 63,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 63,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 64,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 64,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 64,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
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+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"let x = 3;\\\\nlet y = 4;\\\\nlet z = 5;\\\\nx = y = z = 6;\\\\nx;\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "sequence",
+ Array [
+ Array [
+ Array [
+ "variable_declaration",
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 3,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "variable_declaration",
+ Array [
+ Array [
+ "name",
+ Array [
+ "y",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 4,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "variable_declaration",
+ Array [
+ Array [
+ "name",
+ Array [
+ "z",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 5,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "assignment",
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "assignment",
+ Array [
+ Array [
+ "name",
+ Array [
+ "y",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "assignment",
+ Array [
+ Array [
+ "name",
+ Array [
+ "z",
+ null,
+ ],
+ ],
+ Array [
+ Array [
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+ Array [
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+ null,
],
+ ],
+ null,
+ ],
+ ],
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+ null,
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+ ],
+ ],
+ null,
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+ ],
+ ],
+ Array [
+ Array [
+ "name",
+ Array [
+ "x",
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 24 1`] = `
+"Line 1: Rest elements are not allowed
+Line 4: Array expressions are not allowed
+Line 4: Spread elements are not allowed"
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 24 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 3,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
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+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
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+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "function f(x, y, ...z) {
+ return x + y;
+}
+f(...[1, 2]);",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "function f(x, y, ...z) {
+ return x + y;
+}
+f(...[1, 2]);",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": 3,
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 24 3`] = `
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+ "chapter": 4,
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+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"function f(x, y, ...z) {\\\\n return x + y;\\\\n}\\\\nf(...[1, 2]);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"function f(x, y, ...z) {\\\\n return x + y;\\\\n}\\\\nf(...[1, 2]);\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
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+ "status": "finished",
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+ ],
+ ],
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+ Array [
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+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 25 1`] = `"Line 1: Object expressions are not allowed"`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 25 2`] = `
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+ "context": Object {
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+ "has_own_property" => [Function],
+ "alert" => [Function],
+ "timed" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
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+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
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+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_object" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_NaN" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "has_own_property" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "alert" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "timed" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "({});",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 100,
+ "debugger": Object {
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+ },
+ "state": Object {
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+ "math_exp" => [Function],
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+ "operators": Map {
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+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
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+ },
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+ "stream_length",
+ "stream_map",
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+ "stream_for_each",
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+ "numberOfOuterEnvironments": 1,
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+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_round" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sign" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sin" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sinh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_object" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_NaN" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "has_own_property" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "alert" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "timed" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "({});",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Object {},
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 25 3`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 100,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ "is_object" => [Function],
+ "is_NaN" => [Function],
+ "has_own_property" => [Function],
+ "alert" => [Function],
+ "timed" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 15,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 13,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 13,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"({});\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "({});",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 14,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 14,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 15,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 15,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 15,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "alert": [Function],
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "has_own_property": [Function],
+ "head": [Function],
+ "is_NaN": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_object": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
+ "is_undefined": [Function],
+ "list": [Function],
+ "math_E": 2.718281828459045,
+ "math_LN10": 2.302585092994046,
+ "math_LN2": 0.6931471805599453,
+ "math_LOG10E": 0.4342944819032518,
+ "math_LOG2E": 1.4426950408889634,
+ "math_PI": 3.141592653589793,
+ "math_SQRT1_2": 0.7071067811865476,
+ "math_SQRT2": 1.4142135623730951,
+ "math_abs": [Function],
+ "math_acos": [Function],
+ "math_acosh": [Function],
+ "math_asin": [Function],
+ "math_asinh": [Function],
+ "math_atan": [Function],
+ "math_atan2": [Function],
+ "math_atanh": [Function],
+ "math_cbrt": [Function],
+ "math_ceil": [Function],
+ "math_clz32": [Function],
+ "math_cos": [Function],
+ "math_cosh": [Function],
+ "math_exp": [Function],
+ "math_expm1": [Function],
+ "math_floor": [Function],
+ "math_fround": [Function],
+ "math_hypot": [Function],
+ "math_imul": [Function],
+ "math_log": [Function],
+ "math_log10": [Function],
+ "math_log1p": [Function],
+ "math_log2": [Function],
+ "math_max": [Function],
+ "math_min": [Function],
+ "math_pow": [Function],
+ "math_random": [Function],
+ "math_round": [Function],
+ "math_sign": [Function],
+ "math_sin": [Function],
+ "math_sinh": [Function],
+ "math_sqrt": [Function],
+ "math_tan": [Function],
+ "math_tanh": [Function],
+ "math_trunc": [Function],
+ "pair": [Function],
+ "parse": [Function],
+ "parse_int": [Function],
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+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_NaN" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "has_own_property" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "alert" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "timed" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"({});\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 100,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ "is_object" => [Function],
+ "is_NaN" => [Function],
+ "has_own_property" => [Function],
+ "alert" => [Function],
+ "timed" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 15,
+ "expression": Node {
+ "arguments": Array [
+ Node {
+ "end": 13,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 13,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 6,
+ "line": 1,
+ },
+ },
+ "raw": "\\"({});\\"",
+ "start": 6,
+ "type": "Literal",
+ "value": "({});",
+ },
+ ],
+ "callee": Node {
+ "end": 5,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 5,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "name": "parse",
+ "start": 0,
+ "type": "Identifier",
+ },
+ "end": 14,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 14,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "CallExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 15,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 15,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 15,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
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+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_object" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_NaN" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "has_own_property" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "alert" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "timed" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"({});\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "object_expression",
+ Array [
+ null,
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 26 1`] = `"Line 1: Object expressions are not allowed"`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 26 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 100,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ "is_object" => [Function],
+ "is_NaN" => [Function],
+ "has_own_property" => [Function],
+ "alert" => [Function],
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+ "tailType": Object {
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+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_object" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_NaN" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "has_own_property" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "alert" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "timed" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "({a: 1, b: 2});",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
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+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_object" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_NaN" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "has_own_property" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "alert" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "timed" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "({a: 1, b: 2});",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Object {
+ "a": 1,
+ "b": 2,
+ },
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 26 3`] = `
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+ "alertResult": Array [],
+ "chapter": 100,
+ "debugger": Object {
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+ "executionMethod": "native",
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+ "externalSymbols": Array [],
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+ "is_object" => [Function],
+ "is_NaN" => [Function],
+ "has_own_property" => [Function],
+ "alert" => [Function],
+ "timed" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
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+ "$length",
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+ "map",
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+ "$enum_list",
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+ "$accumulate",
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+ "stream_to_list",
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+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
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+ "prelude": null,
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+ },
+ },
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+ },
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+ },
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+ },
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+ "start": 0,
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+ },
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+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
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+ "storage": null,
+ },
+ "id": "-1",
+ "name": "global",
+ "tail": null,
+ },
+ "parent": null,
+ },
+ "map": Map {
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+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_object" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_NaN" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "has_own_property" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "alert" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "timed" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"({a: 1, b: 2});\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 100,
+ "debugger": Object {
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+ },
+ "state": Object {
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+ "operators": Map {
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+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_sqrt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tan" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_tanh" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_trunc" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "parse_int" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "prompt" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "get_time" => Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "stringify" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "error" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "-_1" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "!" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "&&" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "||" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "<=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ ">=" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "+" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ ],
+ "returnType": Object {
+ "constraint": "addable",
+ "kind": "variable",
+ "name": "A",
+ },
+ },
+ "typeParams": undefined,
+ },
+ "%" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "-" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "*" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_object" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_NaN" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "has_own_property" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "alert" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "timed" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"({a: 1, b: 2});\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "status": "finished",
+ "value": Array [
+ "object_expression",
+ Array [
+ Array [
+ Array [
+ "key_value_pair",
+ Array [
+ Array [
+ "property",
+ Array [
+ "a",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 1,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ Array [
+ Array [
+ "key_value_pair",
+ Array [
+ Array [
+ "property",
+ Array [
+ "b",
+ null,
+ ],
+ ],
+ Array [
+ Array [
+ "literal",
+ Array [
+ 2,
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ ],
+ null,
+ ],
+ ],
+ null,
+ ],
+ ],
+ },
+}
+`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 27 1`] = `"Line 1: Object expressions are not allowed"`;
+
+exports[`Syntaxes are allowed in the chapter they are introduced 27 2`] = `
+Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 100,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ "is_object" => [Function],
+ "is_NaN" => [Function],
+ "has_own_property" => [Function],
+ "alert" => [Function],
+ "timed" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
+ "stream_filter",
+ "enum_stream",
+ "integers_from",
+ "eval_stream",
+ "stream_ref",
+ },
+ },
+ "numberOfOuterEnvironments": 1,
+ "prelude": null,
+ "previousPrograms": Array [
+ Object {
+ "body": Array [
+ Node {
+ "end": 20,
+ "expression": Node {
+ "computed": true,
+ "end": 19,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 19,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "object": Node {
+ "end": 13,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 13,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 1,
+ "line": 1,
+ },
+ },
+ "properties": Array [
+ Node {
+ "computed": false,
+ "end": 6,
+ "key": Node {
+ "end": 3,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 3,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 2,
+ "line": 1,
+ },
+ },
+ "name": "a",
+ "start": 2,
+ "type": "Identifier",
+ },
+ "kind": "init",
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 6,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 2,
+ "line": 1,
+ },
+ },
+ "method": false,
+ "shorthand": false,
+ "start": 2,
+ "type": "Property",
+ "value": Node {
+ "end": 6,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 6,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 5,
+ "line": 1,
+ },
+ },
+ "raw": "1",
+ "start": 5,
+ "type": "Literal",
+ "value": 1,
+ },
+ },
+ Node {
+ "computed": false,
+ "end": 12,
+ "key": Node {
+ "end": 9,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 9,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 8,
+ "line": 1,
+ },
+ },
+ "name": "b",
+ "start": 8,
+ "type": "Identifier",
+ },
+ "kind": "init",
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 12,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 8,
+ "line": 1,
+ },
+ },
+ "method": false,
+ "shorthand": false,
+ "start": 8,
+ "type": "Property",
+ "value": Node {
+ "end": 12,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 12,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 11,
+ "line": 1,
+ },
+ },
+ "raw": "2",
+ "start": 11,
+ "type": "Literal",
+ "value": 2,
+ },
+ },
+ ],
+ "start": 1,
+ "type": "ObjectExpression",
+ },
+ "property": Node {
+ "end": 18,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 18,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 15,
+ "line": 1,
+ },
+ },
+ "raw": "'a'",
+ "start": 15,
+ "type": "Literal",
+ "value": "a",
+ },
+ "start": 0,
+ "type": "MemberExpression",
+ },
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 20,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "start": 0,
+ "type": "ExpressionStatement",
+ },
+ ],
+ "end": 20,
+ "loc": SourceLocation {
+ "end": Position {
+ "column": 20,
+ "line": 1,
+ },
+ "start": Position {
+ "column": 0,
+ "line": 1,
+ },
+ },
+ "sourceType": "module",
+ "start": 0,
+ "type": "Program",
+ },
+ ],
+ "promptResult": Array [],
+ "runtime": Object {
+ "break": false,
+ "breakpointSteps": Array [],
+ "changepointSteps": Array [],
+ "control": null,
+ "debuggerOn": true,
+ "envSteps": -1,
+ "envStepsTotal": 0,
+ "environmentTree": EnvTree {
+ "_root": EnvTreeNode {
+ "_children": Array [],
+ "environment": Object {
+ "head": Object {
+ "Infinity": Infinity,
+ "NaN": NaN,
+ "alert": [Function],
+ "apply_in_underlying_javascript": [Function],
+ "arity": [Function],
+ "array_length": [Function],
+ "call_cc": [Function],
+ "char_at": [Function],
+ "display": [Function],
+ "display_list": [Function],
+ "draw_data": [Function],
+ "error": [Function],
+ "get_time": [Function],
+ "has_own_property": [Function],
+ "head": [Function],
+ "is_NaN": [Function],
+ "is_array": [Function],
+ "is_boolean": [Function],
+ "is_function": [Function],
+ "is_list": [Function],
+ "is_null": [Function],
+ "is_number": [Function],
+ "is_object": [Function],
+ "is_pair": [Function],
+ "is_string": [Function],
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+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_object" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_NaN" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "has_own_property" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "alert" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "timed" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "({a: 1, b: 2})['a'];",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
+",
+ ],
+ "variant": "default",
+ "visualiseListResult": Array [],
+ },
+ "result": Object {
+ "context": Object {
+ "alertResult": Array [],
+ "chapter": 100,
+ "debugger": Object {
+ "observers": Object {
+ "callbacks": Array [],
+ },
+ "state": Object {
+ "it": Object {},
+ },
+ "status": false,
+ },
+ "displayResult": Array [],
+ "errors": Array [],
+ "executionMethod": "native",
+ "externalContext": undefined,
+ "externalSymbols": Array [],
+ "moduleContexts": Object {},
+ "nativeStorage": Object {
+ "builtins": Map {
+ "get_time" => [Function],
+ "display" => [Function],
+ "raw_display" => [Function],
+ "stringify" => [Function],
+ "error" => [Function],
+ "prompt" => [Function],
+ "is_number" => [Function],
+ "is_string" => [Function],
+ "is_function" => [Function],
+ "is_boolean" => [Function],
+ "is_undefined" => [Function],
+ "parse_int" => [Function],
+ "char_at" => [Function],
+ "arity" => [Function],
+ "undefined" => undefined,
+ "NaN" => NaN,
+ "Infinity" => Infinity,
+ "math_abs" => [Function],
+ "math_acos" => [Function],
+ "math_acosh" => [Function],
+ "math_asin" => [Function],
+ "math_asinh" => [Function],
+ "math_atan" => [Function],
+ "math_atanh" => [Function],
+ "math_atan2" => [Function],
+ "math_ceil" => [Function],
+ "math_cbrt" => [Function],
+ "math_expm1" => [Function],
+ "math_clz32" => [Function],
+ "math_cos" => [Function],
+ "math_cosh" => [Function],
+ "math_exp" => [Function],
+ "math_floor" => [Function],
+ "math_fround" => [Function],
+ "math_hypot" => [Function],
+ "math_imul" => [Function],
+ "math_log" => [Function],
+ "math_log1p" => [Function],
+ "math_log2" => [Function],
+ "math_log10" => [Function],
+ "math_max" => [Function],
+ "math_min" => [Function],
+ "math_pow" => [Function],
+ "math_random" => [Function],
+ "math_round" => [Function],
+ "math_sign" => [Function],
+ "math_sin" => [Function],
+ "math_sinh" => [Function],
+ "math_sqrt" => [Function],
+ "math_tan" => [Function],
+ "math_tanh" => [Function],
+ "math_trunc" => [Function],
+ "math_E" => 2.718281828459045,
+ "math_LN10" => 2.302585092994046,
+ "math_LN2" => 0.6931471805599453,
+ "math_LOG10E" => 0.4342944819032518,
+ "math_LOG2E" => 1.4426950408889634,
+ "math_PI" => 3.141592653589793,
+ "math_SQRT1_2" => 0.7071067811865476,
+ "math_SQRT2" => 1.4142135623730951,
+ "pair" => [Function],
+ "is_pair" => [Function],
+ "head" => [Function],
+ "tail" => [Function],
+ "is_null" => [Function],
+ "list" => [Function],
+ "draw_data" => [Function],
+ "display_list" => [Function],
+ "is_list" => [Function],
+ "set_head" => [Function],
+ "set_tail" => [Function],
+ "array_length" => [Function],
+ "is_array" => [Function],
+ "stream" => [Function],
+ "parse" => [Function],
+ "tokenize" => [Function],
+ "apply_in_underlying_javascript" => [Function],
+ "call_cc" => [Function],
+ "is_object" => [Function],
+ "is_NaN" => [Function],
+ "has_own_property" => [Function],
+ "alert" => [Function],
+ "timed" => [Function],
+ },
+ "evaller": [Function],
+ "loadedModuleTypes": Object {},
+ "loadedModules": Object {},
+ "maxExecTime": 1000,
+ "operators": Map {
+ "throwIfTimeout" => [Function],
+ "callIfFuncAndRightArgs" => [Function],
+ "boolOrErr" => [Function],
+ "unaryOp" => [Function],
+ "evaluateUnaryExpression" => [Function],
+ "binaryOp" => [Function],
+ "evaluateBinaryExpression" => [Function],
+ "callIteratively" => [Function],
+ "wrap" => [Function],
+ "setProp" => [Function],
+ "getProp" => [Function],
+ },
+ "previousProgramsIdentifiers": Set {
+ "equal",
+ "$length",
+ "length",
+ "$map",
+ "map",
+ "$build_list",
+ "build_list",
+ "for_each",
+ "$list_to_string",
+ "list_to_string",
+ "$reverse",
+ "reverse",
+ "$append",
+ "append",
+ "member",
+ "$remove",
+ "remove",
+ "$remove_all",
+ "remove_all",
+ "$filter",
+ "filter",
+ "$enum_list",
+ "enum_list",
+ "list_ref",
+ "$accumulate",
+ "accumulate",
+ "__access_named_export__",
+ "__access_export__",
+ "stream_tail",
+ "is_stream",
+ "list_to_stream",
+ "stream_to_list",
+ "stream_length",
+ "stream_map",
+ "build_stream",
+ "stream_for_each",
+ "stream_reverse",
+ "stream_append",
+ "stream_member",
+ "stream_remove",
+ "stream_remove_all",
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+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_object" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_NaN" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "has_own_property" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "alert" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "timed" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "({a: 1, b: 2})['a'];",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
+// is replaced by the second argument stream
+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
+function stream_append(xs, ys) {
+ return is_null(xs)
+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
+// second argument stream. It returns the first postfix substream
+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
+function stream_member(x, s) {
+ return is_null(s)
+ ? null
+ : head(s) === x
+ ? s
+ : stream_member(x, stream_tail(s));
+}
+
+// stream_remove removes the first occurrence of a given first-argument element
+// in a given second-argument list. Returns the original list
+// if there is no occurrence.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_tail(xs)
+ : pair(head(xs),
+ () => stream_remove(v, stream_tail(xs)));
+}
+
+// stream_remove_all removes all instances of v instead of just the first.
+// Lazy? Yes: the result stream forces the construction of each next element
+function stream_remove_all(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
+// for which the given predicate function p returns true.
+// Lazy? Yes: The result stream forces the construction of
+// each next element. Of course, the construction
+// of the next element needs to go down the stream
+// until an element is found for which p holds.
+function stream_filter(p, s) {
+ return is_null(s)
+ ? null
+ : p(head(s))
+ ? pair(head(s),
+ () => stream_filter(p, stream_tail(s)))
+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
+// using a step size of 1, until the number
+// exceeds end.
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function enum_stream(start, end) {
+ return start > end
+ ? null
+ : pair(start,
+ () => enum_stream(start + 1, end));
+}
+
+// integers_from constructs an infinite stream of integers
+// starting at a given number n
+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
+// eval_stream constructs the list of the first n elements
+// of a given stream s
+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function eval_stream(s, n) {
+ function es(s, n) {
+ return n === 1
+ ? list(head(s))
+ : pair(head(s),
+ es(stream_tail(s), n - 1));
+ }
+ return n === 0
+ ? null
+ : es(s, n);
+}
+
+// Returns the item in stream s at index n (the first item is at position 0)
+// Lazy? Sort-of: stream_ref only forces the computation of
+// the first n elements, and leaves the rest of
+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
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+ "variant": "default",
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+}
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+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "/" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ },
+ "typeParams": undefined,
+ },
+ "head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_pair" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_null" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_list" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "===" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "!==" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T2",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_head" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "set_tail" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "is_array" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "array_length" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "array",
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "raw_display" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "char_at" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "arity" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "draw_data" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "display_list" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "parse" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "tokenize" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "apply_in_underlying_javascript" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "call_cc" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_object" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "is_NaN" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "has_own_property" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "alert" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ "timed" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T1",
+ "typeArgs": undefined,
+ },
+ "typeParams": undefined,
+ },
+ },
+ },
+ ],
+ "unTypecheckedCode": Array [
+ "parse(\\"({a: 1, b: 2})['a'];\\");",
+ "
+
+// equal computes the structural equality
+// over its arguments
+
+function equal(xs, ys) {
+ return is_pair(xs)
+ ? (is_pair(ys) &&
+ equal(head(xs), head(ys)) &&
+ equal(tail(xs), tail(ys)))
+ : is_null(xs)
+ ? is_null(ys)
+ : is_number(xs)
+ ? (is_number(ys) && xs === ys)
+ : is_boolean(xs)
+ ? (is_boolean(ys) && ((xs && ys) || (!xs && !ys)))
+ : is_string(xs)
+ ? (is_string(ys) && xs === ys)
+ : is_undefined(xs)
+ ? is_undefined(ys)
+ : is_function(xs)
+ // we know now that xs is a function,
+ // but we use an if check anyway to make use of the type predicate
+ ? (is_function(ys) && xs === ys)
+ : false;
+}
+
+
+// returns the length of a given argument list
+// assumes that the argument is a list
+
+function $length(xs, acc) {
+ return is_null(xs) ? acc : $length(tail(xs), acc + 1);
+}
+function length(xs) {
+ return $length(xs, 0);
+}
+
+// map applies first arg f, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// f is applied element-by-element:
+// map(f, list(1, 2)) results in list(f(1), f(2))
+
+function $map(f, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : $map(f, tail(xs), pair(f(head(xs)), acc));
+}
+function map(f, xs) {
+ return $map(f, xs, null);
+}
+
+// build_list takes a a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_list returns a list of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+
+function $build_list(i, fun, already_built) {
+ return i < 0 ? already_built : $build_list(i - 1, fun, pair(fun(i), already_built));
+}
+
+function build_list(fun, n) {
+ return $build_list(n - 1, fun, null);
+}
+
+// for_each applies first arg fun, assumed to be a unary function,
+// to the elements of the second argument, assumed to be a list.
+// fun is applied element-by-element:
+// for_each(fun, list(1, 2)) results in the calls fun(1) and fun(2).
+// for_each returns true.
+
+function for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return for_each(fun, tail(xs));
+ }
+}
+
+// list_to_string returns a string that represents the argument list.
+// It applies itself recursively on the elements of the given list.
+// When it encounters a non-list, it applies to_string to it.
+
+function $list_to_string(xs, cont) {
+ return is_null(xs)
+ ? cont(\\"null\\")
+ : is_pair(xs)
+ ? $list_to_string(
+ head(xs),
+ x => $list_to_string(
+ tail(xs),
+ y => cont(\\"[\\" + x + \\",\\" + y + \\"]\\")))
+ : cont(stringify(xs));
+}
+
+function list_to_string(xs) {
+ return $list_to_string(xs, x => x);
+}
+
+// reverse reverses the argument, assumed to be a list
+
+function $reverse(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : $reverse(tail(original), pair(head(original), reversed));
+}
+
+function reverse(xs) {
+ return $reverse(xs, null);
+}
+
+// append first argument, assumed to be a list, to the second argument.
+// In the result null at the end of the first argument list
+// is replaced by the second argument, regardless what the second
+// argument consists of.
+
+function $append(xs, ys, cont) {
+ return is_null(xs)
+ ? cont(ys)
+ : $append(tail(xs), ys, zs => cont(pair(head(xs), zs)));
+}
+
+function append(xs, ys) {
+ return $append(xs, ys, xs => xs);
+}
+
+// member looks for a given first-argument element in the
+// second argument, assumed to be a list. It returns the first
+// postfix sublist that starts with the given element. It returns null if the
+// element does not occur in the list
+
+function member(v, xs) {
+ return is_null(xs)
+ ? null
+ : v === head(xs)
+ ? xs
+ : member(v, tail(xs));
+}
+
+// removes the first occurrence of a given first-argument element
+// in second-argument, assmed to be a list. Returns the original
+// list if there is no occurrence.
+
+function $remove(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? app(rev(acc), tail(xs))
+ : $remove(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove(v, xs) {
+ return $remove(v, xs, null);
+}
+
+// Similar to remove, but removes all instances of v
+// instead of just the first
+
+function $remove_all(v, xs, acc) {
+ // Ensure that typechecking of append and reverse are done independently
+ const app = append;
+ const rev = reverse;
+ return is_null(xs)
+ ? app(rev(acc), xs)
+ : v === head(xs)
+ ? $remove_all(v, tail(xs), acc)
+ : $remove_all(v, tail(xs), pair(head(xs), acc));
+}
+
+function remove_all(v, xs) {
+ return $remove_all(v, xs, null);
+}
+
+// filter returns the sublist of elements of the second argument
+// (assumed to be a list), for which the given predicate function
+// returns true.
+
+function $filter(pred, xs, acc) {
+ return is_null(xs)
+ ? reverse(acc)
+ : pred(head(xs))
+ ? $filter(pred, tail(xs), pair(head(xs), acc))
+ : $filter(pred, tail(xs), acc);
+}
+
+function filter(pred, xs) {
+ return $filter(pred, xs, null);
+}
+
+// enumerates numbers starting from start, assumed to be a number,
+// using a step size of 1, until the number exceeds end, assumed
+// to be a number
+
+function $enum_list(start, end, acc) {
+ // Ensure that typechecking of reverse are done independently
+ const rev = reverse;
+ return start > end
+ ? rev(acc)
+ : $enum_list(start + 1, end, pair(start, acc));
+}
+
+function enum_list(start, end) {
+ return $enum_list(start, end, null);
+}
+
+// Returns the item in xs (assumed to be a list) at index n,
+// assumed to be a nonnegative integer.
+// Note: the first item is at position 0
+
+function list_ref(xs, n) {
+ return n === 0
+ ? head(xs)
+ : list_ref(tail(xs), n - 1);
+}
+
+// accumulate applies an operation op (assumed to be a binary function)
+// to elements of sequence (assumed to be a list) in a right-to-left order.
+// first apply op to the last element and initial, resulting in r1, then to
+// the second-last element and r1, resulting in r2, etc, and finally
+// to the first element and r_n-1, where n is the length of the
+// list.
+// accumulate(op, zero, list(1, 2, 3)) results in
+// op(1, op(2, op(3, zero)))
+
+function $accumulate(f, initial, xs, cont) {
+ return is_null(xs)
+ ? cont(initial)
+ : $accumulate(f, initial, tail(xs), x => cont(f(head(xs), x)));
+}
+
+function accumulate(f, initial, xs) {
+ return $accumulate(f, initial, xs, x => x);
+}
+
+function __access_named_export__(named_exports, lookup_name) {
+ if (is_null(named_exports)) {
+ return undefined;
+ } else {
+ const name = head(head(named_exports));
+ const identifier = tail(head(named_exports));
+ if (name === lookup_name) {
+ return identifier;
+ } else {
+ return __access_named_export__(tail(named_exports), lookup_name);
+ }
+ }
+}
+
+function __access_export__(exports, lookup_name) {
+ if (lookup_name === \\"default\\") {
+ return head(exports);
+ } else {
+ const named_exports = tail(exports);
+ return __access_named_export__(named_exports, lookup_name);
+ }
+}
+
+
+// Supporting streams in the Scheme style, following
+// \\"stream discipline\\"
+
+// stream_tail returns the second component of the given pair
+// throws an error if the argument is not a pair
+
+function stream_tail(xs) {
+ if (is_pair(xs)) {
+ const the_tail = tail(xs);
+ if (is_function(the_tail)) {
+ return the_tail();
+ } else {
+ error(the_tail,
+ 'stream_tail(xs) expects a function as ' +
+ 'the tail of the argument pair xs, ' +
+ 'but encountered ');
+ }
+ } else {
+ error(xs, 'stream_tail(xs) expects a pair as ' +
+ 'argument xs, but encountered ');
+ }
+}
+
+// is_stream recurses down the stream and checks that it ends with the
+// empty list null
+
+function is_stream(xs) {
+ return is_null(xs) ||
+ (is_pair(xs) &&
+ is_function(tail(xs)) &&
+ arity(tail(xs)) === 0 &&
+ is_stream(stream_tail(xs)));
+}
+
+// A stream is either null or a pair whose tail is
+// a nullary function that returns a stream.
+
+function list_to_stream(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs),
+ () => list_to_stream(tail(xs)));
+}
+
+// stream_to_list transforms a given stream to a list
+// Lazy? No: stream_to_list needs to force the whole stream
+function stream_to_list(xs) {
+ return is_null(xs)
+ ? null
+ : pair(head(xs), stream_to_list(stream_tail(xs)));
+}
+
+// stream_length returns the length of a given argument stream
+// throws an exception if the argument is not a stream
+// Lazy? No: The function needs to explore the whole stream
+function stream_length(xs) {
+ return is_null(xs)
+ ? 0
+ : 1 + stream_length(stream_tail(xs));
+}
+
+// stream_map applies first arg f to the elements of the second
+// argument, assumed to be a stream.
+// f is applied element-by-element:
+// stream_map(f,list_to_stream(list(1,2)) results in
+// the same as list_to_stream(list(f(1),f(2)))
+// stream_map throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? Yes: The argument stream is only explored as forced by
+// the result stream.
+function stream_map(f, s) {
+ return is_null(s)
+ ? null
+ : pair(f(head(s)),
+ () => stream_map(f, stream_tail(s)));
+}
+
+// build_stream takes a function fun as first argument,
+// and a nonnegative integer n as second argument,
+// build_stream returns a stream of n elements, that results from
+// applying fun to the numbers from 0 to n-1.
+// Lazy? Yes: The result stream forces the applications of fun
+// for the next element
+function build_stream(fun, n) {
+ function build(i) {
+ return i >= n
+ ? null
+ : pair(fun(i),
+ () => build(i + 1));
+ }
+ return build(0);
+}
+
+// stream_for_each applies first arg fun to the elements of the stream
+// passed as second argument. fun is applied element-by-element:
+// for_each(fun,list_to_stream(list(1, 2,null))) results in the calls fun(1)
+// and fun(2).
+// stream_for_each returns true.
+// stream_for_each throws an exception if the second argument is not a
+// stream, and if the second argument is a nonempty stream and the
+// first argument is not a function.
+// Lazy? No: stream_for_each forces the exploration of the entire stream
+function stream_for_each(fun, xs) {
+ if (is_null(xs)) {
+ return true;
+ } else {
+ fun(head(xs));
+ return stream_for_each(fun, stream_tail(xs));
+ }
+}
+
+// stream_reverse reverses the argument stream
+// stream_reverse throws an exception if the argument is not a stream.
+// Lazy? No: stream_reverse forces the exploration of the entire stream
+function stream_reverse(xs) {
+ function rev(original, reversed) {
+ return is_null(original)
+ ? reversed
+ : rev(stream_tail(original),
+ pair(head(original), () => reversed));
+ }
+ return rev(xs, null);
+}
+
+// stream_append appends first argument stream and second argument stream.
+// In the result, null at the end of the first argument stream
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+// stream_append throws an exception if the first argument is not a
+// stream.
+// Lazy? Yes: the result stream forces the actual append operation
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+ ? ys
+ : pair(head(xs),
+ () => stream_append(stream_tail(xs), ys));
+}
+
+// stream_member looks for a given first-argument element in a given
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+// that starts with the given element. It returns null if the
+// element does not occur in the stream
+// Lazy? Sort-of: stream_member forces the stream only until the element is found.
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+}
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+// stream_remove removes the first occurrence of a given first-argument element
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+ : pair(head(xs),
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+}
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+ ? stream_remove_all(v, stream_tail(xs))
+ : pair(head(xs), () => stream_remove_all(v, stream_tail(xs)));
+}
+
+// filter returns the substream of elements of given stream s
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+// until an element is found for which p holds.
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+ ? null
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+ ? pair(head(s),
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+ : stream_filter(p, stream_tail(s));
+}
+
+// enumerates numbers starting from start,
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+// Lazy? Yes: The result stream forces the construction of
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+}
+
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+// Lazy? Yes: The result stream forces the construction of
+// each next element
+function integers_from(n) {
+ return pair(n,
+ () => integers_from(n + 1));
+}
+
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+// Lazy? Sort-of: eval_stream only forces the computation of
+// the first n elements, and leaves the rest of
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+function eval_stream(s, n) {
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+// Returns the item in stream s at index n (the first item is at position 0)
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+// the stream untouched.
+function stream_ref(s, n) {
+ return n === 0
+ ? head(s)
+ : stream_ref(stream_tail(s), n - 1);
+}
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+ "math_E" => "const",
+ "math_LN2" => "const",
+ "math_LN10" => "const",
+ "math_LOG2E" => "const",
+ "math_LOG10E" => "const",
+ "math_PI" => "const",
+ "math_SQRT1_2" => "const",
+ "math_SQRT2" => "const",
+ "is_boolean" => "const",
+ "is_number" => "const",
+ "is_string" => "const",
+ "is_undefined" => "const",
+ "is_function" => "const",
+ "math_abs" => "const",
+ "math_acos" => "const",
+ "math_acosh" => "const",
+ "math_asin" => "const",
+ "math_asinh" => "const",
+ "math_atan" => "const",
+ "math_atan2" => "const",
+ "math_atanh" => "const",
+ "math_cbrt" => "const",
+ "math_ceil" => "const",
+ "math_clz32" => "const",
+ "math_cos" => "const",
+ "math_cosh" => "const",
+ "math_exp" => "const",
+ "math_expm1" => "const",
+ "math_floor" => "const",
+ "math_fround" => "const",
+ "math_hypot" => "const",
+ "math_imul" => "const",
+ "math_log" => "const",
+ "math_log1p" => "const",
+ "math_log2" => "const",
+ "math_log10" => "const",
+ "math_max" => "const",
+ "math_min" => "const",
+ "math_pow" => "const",
+ "math_random" => "const",
+ "math_round" => "const",
+ "math_sign" => "const",
+ "math_sin" => "const",
+ "math_sinh" => "const",
+ "math_sqrt" => "const",
+ "math_tan" => "const",
+ "math_tanh" => "const",
+ "math_trunc" => "const",
+ "parse_int" => "const",
+ "prompt" => "const",
+ "get_time" => "const",
+ "stringify" => "const",
+ "display" => "const",
+ "error" => "const",
+ "-_1" => "const",
+ "!" => "const",
+ "&&" => "const",
+ "||" => "const",
+ "<" => "const",
+ "<=" => "const",
+ ">" => "const",
+ ">=" => "const",
+ "+" => "const",
+ "%" => "const",
+ "-" => "const",
+ "*" => "const",
+ "/" => "const",
+ "pair" => "const",
+ "head" => "const",
+ "tail" => "const",
+ "is_pair" => "const",
+ "is_null" => "const",
+ "is_list" => "const",
+ "list" => "const",
+ "===" => "const",
+ "!==" => "const",
+ "set_head" => "const",
+ "set_tail" => "const",
+ "is_array" => "const",
+ "array_length" => "const",
+ "raw_display" => "const",
+ "char_at" => "const",
+ "arity" => "const",
+ "draw_data" => "const",
+ "display_list" => "const",
+ "stream" => "const",
+ "parse" => "const",
+ "tokenize" => "const",
+ "apply_in_underlying_javascript" => "const",
+ "call_cc" => "const",
+ "is_object" => "const",
+ "is_NaN" => "const",
+ "has_own_property" => "const",
+ "alert" => "const",
+ "timed" => "const",
+ },
+ "typeAliasMap": Map {
+ "Pair" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "headType",
+ "typeArgs": undefined,
+ },
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "tailType",
+ "typeArgs": undefined,
+ },
+ ],
+ },
+ "List" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "elementType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "list",
+ "typeAsPair": undefined,
+ },
+ "typeParams": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ },
+ "Stream" => Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [],
+ "returnType": Object {
+ "headType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ "kind": "pair",
+ "tailType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "Stream",
+ "typeArgs": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ },
+ },
+ },
+ "typeParams": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ },
+ },
+ "typeMap": Map {
+ "Infinity" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": Infinity,
+ },
+ "NaN" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": NaN,
+ },
+ "undefined" => Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ "math_E" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": 2.718281828459045,
+ },
+ "math_LN2" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": 0.6931471805599453,
+ },
+ "math_LN10" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": 2.302585092994046,
+ },
+ "math_LOG2E" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": 1.4426950408889634,
+ },
+ "math_LOG10E" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": 0.4342944819032518,
+ },
+ "math_PI" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": 3.141592653589793,
+ },
+ "math_SQRT1_2" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": 0.7071067811865476,
+ },
+ "math_SQRT2" => Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": 1.4142135623730951,
+ },
+ "is_boolean" => Object {
+ "ifTrueType": Object {
+ "kind": "primitive",
+ "name": "boolean",
+ "value": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_number" => Object {
+ "ifTrueType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_string" => Object {
+ "ifTrueType": Object {
+ "kind": "primitive",
+ "name": "string",
+ "value": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_undefined" => Object {
+ "ifTrueType": Object {
+ "kind": "primitive",
+ "name": "undefined",
+ "value": undefined,
+ },
+ "kind": "predicate",
+ },
+ "is_function" => Object {
+ "ifTrueType": Object {
+ "kind": "forall",
+ "polyType": Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "T",
+ "typeArgs": undefined,
+ },
+ ],
+ "returnType": Object {
+ "constraint": "none",
+ "kind": "variable",
+ "name": "U",
+ "typeArgs": undefined,
+ },
+ },
+ "typeParams": undefined,
+ },
+ "kind": "predicate",
+ },
+ "math_abs" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_acos" => Object {
+ "kind": "function",
+ "parameterTypes": Array [
+ Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ ],
+ "returnType": Object {
+ "kind": "primitive",
+ "name": "number",
+ "value": undefined,
+ },
+ },
+ "math_acosh" =>