unexpected panic in pattern matching

[pmachata]

This is the code that ICEs, as minimal as I could make it.

fn main() {
    let mut v = vec![1, 2, 3];

    match &v[..] {
        [1, ref n, 3] => {},
        [1, 2, 3] => {},
    }
}

$ RUST_BACKTRACE=1 rustc ble.rs
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 'index out of bounds: the len is 0 but the index is 0', /home/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-linux/build/src/librustc/middle/check_match.rs:658

stack backtrace:
   1:         0x5c1b4c4f - sys::backtrace::write::hb08af03691eab78a5kA
   2:         0x5c1dd782 - panicking::on_panic::h37164609ca1c02afBnJ
   3:         0x5c11d63a - rt::unwind::begin_unwind_inner::h24d5e7492198457b43I
   4:         0x5c11dd24 - rt::unwind::begin_unwind_fmt::hee1a09c48e390d87H2I
   5:         0x5c1dd307 - rust_begin_unwind
   6:         0x5c226cb4 - panicking::panic_fmt::h129020744e7a1c43Z9r
   7:         0x5c23022c - panicking::panic_bounds_check::h42fcb0eaffcd0f1058r
   8:         0x59fa83ca - middle::check_match::is_useful::h564cfcfb5611bfb3FRf
   9:         0x59fd47c5 - middle::check_match::is_useful_specialized::h6723fd8117540027XZf
  10:         0x59fd5641 - middle::check_match::is_useful::closure.75994
  11:         0x59fd5309 - iter::Map<I, F>.Iterator::next::h6922741939313682342
  12:         0x59fa783a - middle::check_match::is_useful::h564cfcfb5611bfb3FRf
  13:         0x59fd47c5 - middle::check_match::is_useful_specialized::h6723fd8117540027XZf
  14:         0x59fd5641 - middle::check_match::is_useful::closure.75994
  15:         0x59fd5309 - iter::Map<I, F>.Iterator::next::h6922741939313682342
  16:         0x59fa783a - middle::check_match::is_useful::h564cfcfb5611bfb3FRf
  17:         0x59fd47c5 - middle::check_match::is_useful_specialized::h6723fd8117540027XZf
  18:         0x59fd5641 - middle::check_match::is_useful::closure.75994
  19:         0x59fd5309 - iter::Map<I, F>.Iterator::next::h6922741939313682342
  20:         0x59fa783a - middle::check_match::is_useful::h564cfcfb5611bfb3FRf
  21:         0x59fd47c5 - middle::check_match::is_useful_specialized::h6723fd8117540027XZf
  22:         0x59fd5641 - middle::check_match::is_useful::closure.75994
  23:         0x59fd5309 - iter::Map<I, F>.Iterator::next::h6922741939313682342
  24:         0x59fa783a - middle::check_match::is_useful::h564cfcfb5611bfb3FRf
  25:         0x59fa0852 - middle::check_match::check_expr::h40117a214c57fedfadf
  26:         0x59fa252a - middle::check_match::check_fn::h951fa0814382c1eaKpg
  27:         0x59fa2d8c - visit::walk_item::h4129520673127106273
  28:         0x59fa2baa - middle::check_match::check_crate::hb09e09956c3438ffNcf
  29:         0x5c8364b2 - driver::phase_3_run_analysis_passes::h55e7e7af941f4089xFa
  30:         0x5c81a411 - driver::compile_input::hee81c045ab46c74fIba
  31:         0x5c8e4e6e - run_compiler::h875c1e123fe4ae2cF5b
  32:         0x5c8e2a1c - thunk::F.Invoke<A, R>::invoke::h14796375338076039584
  33:         0x5c8e1770 - rt::unwind::try::try_fn::h17889328263510442428
  34:         0x5c248fe8 - rust_try_inner
  35:         0x5c248fd5 - rust_try
  36:         0x5c8e1e5c - thunk::F.Invoke<A, R>::invoke::h2091551127524498175
  37:         0x5c1c92d5 - sys::thread::thread_start::h1b1bb1e7ac08d3a6yRE
  38:         0x55eeb529 - start_thread
  39:         0x5bda379c - clone
  40:         0xffffffff - <unknown>

$ rustc --version --verbose
rustc 1.0.0-nightly (890293655 2015-02-28) (built 2015-03-01)
binary: rustc
commit-hash: 890293655251c372ea99694c0c9f0795e2663286
commit-date: 2015-02-28
build-date: 2015-03-01
host: x86_64-unknown-linux-gnu
release: 1.0.0-nightly