compiler unexpectedly panicked. "this is a bug."

[davidpbrown]

Two sets of this error:

error: internal compiler error: unexpected panic
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 'assertion failed: slice_layout_is_correct(cx, &member_llvm_types[..], element_type)', ../src/librustc_trans/trans/debuginfo/metadata.rs:577

from running cargo test against
./src/libs.rs that is

pub fn anagrams_for(word: &str, inputs: &[str]) -> Vec<&'static str> {
let outputs = vec!["abc","def"];
outputs
}

and ./tests/anagram.rs that is

extern crate anagram;

#[test]
fn test_no_matches() {
    let inputs = ["hello", "world", "zombies", "pants"];
    let outputs: Vec<&str> = vec![];
    assert_eq!(anagram::anagrams_for("diaper", &inputs), outputs);
}

I don't know what I was expecting.. I'm a noob ;p
I set RUST_BACKTRACE=1 but it's not a --bin so couldn't do cargo run easily; cargo build and test don't seem to offer any backtrace that I can see.

Meta

rustc 1.3.0-nightly (118a5c4c3 2015-07-21)
binary: rustc
commit-hash: 118a5c4c342883606fd96b121d741b133caa0347
commit-date: 2015-07-21
host: i686-unknown-linux-gnu
release: 1.3.0-nightly

[davidpbrown]

So I just found backtrace runs with

RUST_BACKTRACE=1 cargo run

giving:

stack backtrace:
   1: 0xb72eaee0 - sys::backtrace::write::hd817a303213a89c3Sws
   2: 0xb72f4090 - panicking::on_panic::h7a02169f9432305bclx
   3: 0xb72b0a61 - rt::unwind::begin_unwind_inner::h48154f91ae6f6ed5Q0w
   4: 0xb6aa951a - rt::unwind::begin_unwind::h2710919888498253672
   5: 0xb6b8c5c0 - trans::debuginfo::metadata::vec_slice_metadata::h1830ebfd90bf1646CGx
   6: 0xb6b8a140 - trans::debuginfo::metadata::type_metadata::h2648f426ad2ac74cVOx
   7: 0xb6afac6f - trans::debuginfo::create_function_debug_context::h08d8c7facfa94772vVz
   8: 0xb6af86bf - trans::base::new_fn_ctxt::hdee0c565c2428ddcEdi
   9: 0xb6b04597 - trans::base::trans_closure::h5edb680ad908f55ajxi
  10: 0xb6b08486 - trans::base::trans_fn::h958058ddc7c313246Gi
  11: 0xb6b0b8ea - trans::base::trans_item::hf3d1d3047a9fc247h6i
  12: 0xb6b18dd2 - trans::base::trans_crate::h089a808187a5b003eUj
  13: 0xb764eb9c - driver::phase_4_translate_to_llvm::h8438b1d41574c31f5Oa
  14: 0xb764928c - driver::phase_3_run_analysis_passes::closure.16370
  15: 0xb764351c - middle::ty::ctxt<'tcx>::create_and_enter::h715714199811497514
  16: 0xb763e04d - driver::phase_3_run_analysis_passes::h17597039431132956485
  17: 0xb7624640 - driver::compile_input::h5014aac93408544aTba
  18: 0xb77133ed - run_compiler::h77b31ce882f200a2A7b
  19: 0xb771090e - boxed::F.FnBox<A>::call_box::h12138022694166688879
  20: 0xb7710221 - rt::unwind::try::try_fn::h9887116421262948572
  21: 0xb738073a - rust_try_inner
  22: 0xb7380713 - rust_try
  23: 0xb72dd8ec - rt::unwind::try::inner_try::h59ce709208f4b3feJWw
  24: 0xb771042d - boxed::F.FnBox<A>::call_box::h13050231780628061829
  25: 0xb72f2b34 - sys::thread::Thread::new::thread_start::h08638e0fe4db24abw6v
  26: 0xb2ee2f6f - start_thread
  27: 0xb716cbed - clone
  28:        0x0 - <unknown>

[Stebalien]

Dup of #24707 (it should be inputs: &[&str], not inputs: &[str] but this is still a bug).

[huonw]

Closing as a dupe, thanks for filing.