ICE in try access a field of enum

[tioover]

enum Foo {
    Bar {a: usize},
}


fn main() {
    let foo = Foo::Bar {a: 42};
    foo.a += 1;
}

Project ❯ RUST_BACKTRACE=1 rustc test.rs                                       ⏎
test.rs:8:5: 8:10 error: attempted access of field `a` on type `Foo`, but no field with that name was found
test.rs:8     foo.a += 1;
              ^~~~~
error: internal compiler error: ID not mapped to struct fields: enum Foo::Foo (id=4)
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: https://github.com/rust-lang/rust/blob/master/CONTRIBUTING.md#bug-reports
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'Box<Any>', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/libsyntax/diagnostic.rs:189

stack backtrace:
   1:        0x11264126d - sys::backtrace::write::h2f0eebf22a012f95KDA
   2:        0x11266ac34 - panicking::on_panic::h2d130f87f4af87adMsJ
   3:        0x11259c279 - rt::unwind::begin_unwind_inner::h1a1f64f2e0909849ibJ
   4:        0x111d4fd1e - rt::unwind::begin_unwind::h15175361780993285323
   5:        0x111d5064c - diagnostic::Handler::bug::h23435f9fdd104385KdE
   6:        0x10f7f8239 - middle::ty::lookup_struct_fields::hcfa63d5d455b1d22947
   7:        0x10ef7eb5c - check::check_expr_with_unifier::suggest_field_names::h2d7823337504373bcBq
   8:        0x10ef55b52 - check::check_expr_with_unifier::check_field::h299378f7d98e57056uq
   9:        0x10ef795d5 - check::check_expr_with_unifier::h5233460879988672432
  10:        0x10ef4b892 - check::check_expr_with_unifier::check_binop::h83d5b23b6776607eXgq
  11:        0x10ef73b06 - check::check_expr_with_unifier::h10683062894677546464
  12:        0x10ef37265 - check::check_block_with_expected::h98c4be472f33b682P2r
  13:        0x10ef1ead9 - check::check_fn::h75f3466823e4699afmn
  14:        0x10ef348e0 - check::check_bare_fn::heef299f5e2ff7015Vbn
  15:        0x10ef2cec8 - check::check_item::hd818d764a5174b83zun
  16:        0x10eff0f92 - check_crate::closure.35692
  17:        0x10efecb40 - check_crate::hf2d34adf6a37b8a3hfC
  18:        0x10ed3c0da - driver::phase_3_run_analysis_passes::h19eafcd6b91dc30emGa
  19:        0x10ed213d3 - driver::compile_input::hc0fa04a0185cf5d5Nba
  20:        0x10edeebf6 - run_compiler::h4fb68ba30fa1fbedG6b
  21:        0x10edec2e0 - thunk::F.Invoke<A, R>::invoke::h6674872152586368688
  22:        0x10edeae1f - rt::unwind::try::try_fn::h6409312628170534502
  23:        0x1126e4ca8 - rust_try_inner
  24:        0x1126e4c95 - rust_try
  25:        0x10edeb63f - thunk::F.Invoke<A, R>::invoke::h5915792664557581551
  26:        0x1126563e2 - sys::thread::thread_start::he449e30ddbe8a26532E
  27:     0x7fff91099267 - _pthread_body
  28:     0x7fff910991e4 - _pthread_start

[shepmaster]

Slightly smaller example:

enum Foo { Bar }

fn main() {
    Foo::Bar.a;
}

[frewsxcv]

Running with

~/Downloads $ rustc --version
rustc 1.0.0-beta.2 (e9080ec39 2015-04-16) (built 2015-04-16)

@tioover's code block

~/Downloads $ rustc test.rs
test.rs:8:5: 8:10 error: attempted access of field `a` on type `Foo`, but no field with that name was found
test.rs:8     foo.a += 1;
              ^~~~~
error: aborting due to previous error

@shepmaster's code block

~/Downloads $ rustc test.rs
test.rs:4:5: 4:15 error: attempted access of field `a` on type `Foo`, but no field with that name was found
test.rs:4     Foo::Bar.a;
              ^~~~~~~~~~
error: aborting due to previous error

I can't reproduce the ICE. Can this be closed?

[jooert]

Tests added in #24828.

[bombless]

Should be closed now, @tioover