rustc: "error: internal compiler error: no type for node 41: local x (id=41) in fcx 0x7ff2ddbade98"

[a-p-]

Versions:

$ rustc -v
rustc 0.11-pre (c7553ea 2014-04-19 02:11:30 -0700)
host: x86_64-unknown-linux-gnu
$ uname -a
Linux test 3.13-1-amd64 #1 SMP Debian 3.13.7-1 (2014-03-25) x86_64 GNU/Linux
$ 

Code to reproduce the ICE:

#![feature(struct_variant)]

mod a {
  pub enum Enum {  
    EnumStructVariant { x: u8, y: u8, z: u8 }
  }

  pub fn get_enum_struct_variant() {
    EnumStructVariant { x: 1, y: 2, z: 3 }
  }
}

mod b {
  #[cfg(test)]
  mod test {
    use a;

    #[test]
    fn test_enum_struct_variant() {
      let enum_struct_variant = ::a::get_enum_struct_variant();
      match enum_struct_variant {
        a::EnumStructVariant { x, y, z } => {
          assert_eq!(1, x);
          assert_eq!(2, y);
          assert_eq!(3, z);
        },
        _ => fail!(~"no match")  
      }
    }
  }
}

Compilation output:

$ RUST_BACKTRACE=1 rustc --test test.rs 
test.rs:9:5: 9:43 error: mismatched types: expected `()` but found `a::Enum` (expected () but found enum a::Enum)
test.rs:9     EnumStructVariant { x: 1, y: 2, z: 3 }
              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
test.rs:22:9: 22:41 error: mismatched types: expected `()` but found a structure pattern
test.rs:22         a::EnumStructVariant { x, y, z } => {
                   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
error: internal compiler error: no type for node 41: local x (id=41) in fcx 0x7fafd3fcbe98
note: the compiler hit an unexpected failure path. this is a bug.
note: we would appreciate a bug report: http://static.rust-lang.org/doc/master/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at '~Any', /tmp/rust/src/libsyntax/diagnostic.rs:155
stack backtrace:
   1:     0x7fafd710fe80 - rt::backtrace::imp::write::h05ad43ec7787e135wta::v0.11.pre
   2:     0x7fafd7071290 - rt::unwind::begin_unwind_inner::hac94da1cdf3e8a6dZ39::v0.11.pre
   3:     0x7fafd5ae2fb0 - rt::unwind::begin_unwind::h17308229952267765168::v0.11.pre
   4:     0x7fafd5ae4010 - diagnostic::Handler::bug::had96abefee4d50728Xb::v0.11.pre
   5:     0x7fafd7ac6300 - driver::session::Session::bug::h8052d5399f7b4d89iDg::v0.11.pre
   6:     0x7fafd7ce9690 - middle::typeck::check::FnCtxt$LT$$x27a$GT$::node_ty::h266c1c837d478b69KF8::v0.11.pre
   7:     0x7fafd7d09780 - middle::typeck::check::writeback::resolve_type_vars_for_node::hbc48b7050f0443e3Eh2::v0.11.pre
   8:     0x7fafd7d10420 - middle::typeck::check::writeback::visit_pat::haba75e8fd613010cQA2::v0.11.pre
   9:     0x7fafd7d10420 - middle::typeck::check::writeback::visit_pat::haba75e8fd613010cQA2::v0.11.pre
  10:     0x7fafd7d0fd50 - visit::walk_arm::h7056839743020299270::v0.11.pre
  11:     0x7fafd7d0eaf0 - middle::typeck::check::writeback::visit_expr::h3075d0f7ca507c5fGy2::v0.11.pre
  12:     0x7fafd7d100f0 - visit::walk_block::h2390430812655566266::v0.11.pre
  13:     0x7fafd7d13030 - middle::typeck::check::writeback::resolve_type_vars_in_fn::hfeaf21e766baaf3fLQ2::v0.11.pre
  14:     0x7fafd7d59930 - middle::typeck::check::check_bare_fn::he5890947b73331a2Ih7::v0.11.pre
  15:     0x7fafd7d54d10 - middle::typeck::check::check_item::h85092b1644b4d4beQz7::v0.11.pre
  16:     0x7fafd7d566e0 - visit::walk_item::h8774069490031190215::v0.11.pre
  17:     0x7fafd7d566e0 - visit::walk_item::h8774069490031190215::v0.11.pre
  18:     0x7fafd7d59810 - middle::typeck::check::check_item_types::h1b2aba05358d4238ih7::v0.11.pre
  19:     0x7fafd7e987d0 - util::common::time::h1348476385218534042::v0.11.pre
  20:     0x7fafd7e971a0 - middle::typeck::check_crate::h043615a3c22fd0dcfnu::v0.11.pre
  21:     0x7fafd82a8e60 - driver::driver::phase_3_run_analysis_passes::h1b3684c72fd5ff792Pe::v0.11.pre
  22:     0x7fafd82af500 - driver::driver::compile_input::h04718ee069976ad3Xef::v0.11.pre
  23:     0x7fafd82d3b20 - run_compiler::h9b85866479b94c45cOm::v0.11.pre
  24:     0x7fafd82eb3f0 - main_args::closure.91906
  25:     0x7fafd82e9960 - monitor::closure.91784
  26:     0x7fafd82e53a0 - task::TaskBuilder::try::closure.91550
  27:     0x7fafda08ada0 - task::spawn_opts::closure.7776
  28:     0x7fafd710af50 - rt::task::Task::run::closure.39968
  29:     0x7fafd7116be0 - rust_try
  30:     0x7fafd710ad90 - rt::task::Task::run::h484ea9de608dc658uU7::v0.11.pre
  31:     0x7fafda08abb0 - task::spawn_opts::closure.7749
  32:     0x7fafd710ea00 - rt::thread::thread_start::h5274526c2bf07fc4fz8::v0.11.pre
  33:     0x7fafd6a49fa0 - start_thread
  34:     0x7fafd6d44a09 - __clone
  35:                0x0 - <unknown>

$ 

Seems to be fine now but potentially needs a test.

Nope, still failing. An updated example:

#![feature(struct_variant)]

mod a {
  pub enum Enum {  
    EnumStructVariant { x: u8, y: u8, z: u8 }
  }

  pub fn get_enum_struct_variant() {
    EnumStructVariant { x: 1, y: 2, z: 3 }
//~^ ERROR mismatched types: expected `()` but found `a::Enum` (expected () but found enum a::Enum)
  }
}

mod b {
  mod test {
    use a;

    fn test_enum_struct_variant() {
      let enum_struct_variant = ::a::get_enum_struct_variant();
      match enum_struct_variant {
        a::EnumStructVariant { x, y, z } => {
        //~^ ERROR error: mismatched types: expected `()` but found a structure pattern
        }
      }
    }
  }
}

fn main() {}

[michaelsproul]

That code example fails to compile, but it's because the function signature for get_enum_struct_variant is wrong. It should be:

pub fn get_enum_struct_variant() -> Enum;

When you make that change and make the struct fields public, the code compiles fine. Without the change I also didn't see any internal compiler errors.

Rust Version: 0.12.0-pre-nightly, a1429bc, Linux x86_64

Yeah, I think this can be closed.

[alexcrichton]

Flagging as needstest (not sure if one is checked in already)