Disable legacy comprehensions

Author: wcjohnson

src/parser/expression.js

@@ -734,9 +734,6 @@ pp.parseExprAtom = function (refShorthandDefaultPos) {
       }
       node = this.startNode();
       this.next();
-      if (this.hasPlugin("lightscript") && this.match(tt._for)) {
-        return this.parseArrayComprehension(node);
-      }
       node.elements = this.parseExprList(tt.bracketR, true, refShorthandDefaultPos);
       this.toReferencedList(node.elements);
       return this.finishNode(node, "ArrayExpression");
@@ -1053,18 +1050,6 @@ pp.parseObj = function (isPattern, refShorthandDefaultPos) {
   node.properties = [];
   this.next();
 
-  // `for` keyword begins an object comprehension.
-  if (
-    this.hasPlugin("lightscript") &&
-    !this.hasPlugin("splatComprehension") &&
-    this.match(tt._for)
-  ) {
-    // ...however, `{ for: x }` is a legal JS object.
-    if (this.lookahead().type !== tt.colon) {
-      return this.parseObjectComprehension(node);
-    }
-  }
-
   let firstRestLocation = null;
 
   while (!this.eat(tt.braceR)) {

src/plugins/lightscript.js

@@ -120,23 +120,6 @@ pp.expectParenFreeBlockStart = function (node) {
   }
 };
 
-// XXX: legacy
-// [for ...: stmnt]
-pp.parseArrayComprehension = function (node) {
-  const loop = this.startNode();
-  node.loop = this.parseForStatement(loop);
-  this.expect(tt.bracketR);
-  return this.finishNode(node, "ArrayComprehension");
-};
-
-// XXX: legacy
-pp.parseObjectComprehension = function(node) {
-  const loop = this.startNode();
-  node.loop = this.parseForStatement(loop);
-  this.expect(tt.braceR);
-  return this.finishNode(node, "ObjectComprehension");
-};
-
 pp.parseInlineWhiteBlock = function(node) {
   if (this.state.type.startsExpr) return this.parseMaybeAssign();
   // oneline statement case