ICE: cat_expr Errd

[dovahcrow]

maybe a bug in type inference?

I tried this code:

fn main() {
    use std::mem::*;
    let a = 1;
    let b = 2;
    unsafe {swap::<&mut _>(transmute(&a), transmute(&b))};
}

and playpen

Meta

rustc --version --verbose:

rustc 1.0.0-nightly (d17d6e7f1 2015-04-02) (built 2015-04-03)
binary: rustc
commit-hash: d17d6e7f1f05fbdd4d9d246400ffebf768878c7a
commit-date: 2015-04-02
build-date: 2015-04-03
host: x86_64-unknown-linux-gnu
release: 1.0.0-nightly

Backtrace:

thread 'rustc' panicked at 'Box<Any>', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/libsyntax/diagnostic.rs:130

stack backtrace:
   1:     0x7faee32be3b8 - sys::backtrace::write::he4dda5a986f8dfc9IJC
   2:     0x7faee32e9760 - panicking::on_panic::h5b2db6d96c6af729sXI
   3:     0x7faee3221493 - rt::unwind::begin_unwind_inner::h312dab2a9cc03afbACI
   4:     0x7faee05e705d - rt::unwind::begin_unwind::h8552855983279226119
   5:     0x7faee05e7003 - diagnostic::SpanHandler::span_bug::h047bbb0d01e0a28bjnB
   6:     0x7faee0e88b53 - session::Session::span_bug::h8e85b4257a239e266Xq
   7:     0x7faee1f4acad - check::regionck::visit_expr::ha7a7caa6308adb39PJd
   8:     0x7faee1f5327e - visit::walk_expr::h7711135408040361563
   9:     0x7faee1f4a522 - check::regionck::visit_expr::ha7a7caa6308adb39PJd
  10:     0x7faee1f536f8 - visit::walk_expr::h7711135408040361563
  11:     0x7faee1f4a059 - check::regionck::visit_expr::ha7a7caa6308adb39PJd
  12:     0x7faee1f49920 - check::regionck::visit_expr::ha7a7caa6308adb39PJd
  13:     0x7faee1f4a059 - check::regionck::visit_expr::ha7a7caa6308adb39PJd
  14:     0x7faee1f5367d - visit::walk_expr::h7711135408040361563
  15:     0x7faee1f49c31 - check::regionck::visit_expr::ha7a7caa6308adb39PJd
  16:     0x7faee1f49983 - check::regionck::visit_expr::ha7a7caa6308adb39PJd
  17:     0x7faee1f5367d - visit::walk_expr::h7711135408040361563
  18:     0x7faee1f49c31 - check::regionck::visit_expr::ha7a7caa6308adb39PJd
  19:     0x7faee1f4b7da - check::regionck::visit_local::h1d3e9df070391b34UGd
  20:     0x7faee1f53710 - visit::walk_expr::h7711135408040361563
  21:     0x7faee1f4a059 - check::regionck::visit_expr::ha7a7caa6308adb39PJd
  22:     0x7faee1f45ccf - check::regionck::Rcx<'a, 'tcx>::visit_fn_body::he16da04e9c53d9f6amd
  23:     0x7faee1fe0b31 - check::check_bare_fn::h4ed57fcdf8abf23cUQn
  24:     0x7faee1fda614 - check::check_item::h66f023fd6d694e3fF9n
  25:     0x7faee1fded52 - visit::walk_item::h16105192910878993865
  26:     0x7faee1fded5d - visit::walk_item::h16105192910878993865
  27:     0x7faee20b2a41 - check_crate::closure.36300
  28:     0x7faee20ace13 - check_crate::ha6e679122aa8dfb5bwC
  29:     0x7faee393e5cd - driver::phase_3_run_analysis_passes::h001143095bbfc525gGa
  30:     0x7faee3922425 - driver::compile_input::h982ca27ddfea1322Qba
  31:     0x7faee39d99d5 - run_compiler::h46e3b1adb4d7a56fV4b
  32:     0x7faee39d72ed - boxed::F.FnBox<A>::call_box::h10231365352816203841
  33:     0x7faee39d6829 - rt::unwind::try::try_fn::h6438714248533661505
  34:     0x7faee3365c58 - rust_try_inner
  35:     0x7faee3365c45 - rust_try
  36:     0x7faee39d6afb - boxed::F.FnBox<A>::call_box::h8924274584753923957
  37:     0x7faee32d4771 - sys::thread::create::thread_start::h1fdda6dc8c80280aExH
  38:     0x7faedd0c5373 - start_thread
  39:     0x7faee2e9427c - __clone
  40:                0x0 - <unknown>