ICE: 'rustc' panicked at 'assertion failed: *start <= *end'

[jansegre]

I got an ICE while updating rust-protobuf to latest nightly rust (rustc 0.13.0-nightly (88b6e93d3 2014-10-31 23:36:48 +0000)), here's the backtrace:

   Compiling protobuf v0.0.1 (file:///Users/jan/Projects/rust-protobuf)
     Running `rustc src/lib/protobuf.rs --crate-name protobuf --crate-type lib -g -C metadata=6909f272933e7527 -C extra-filename=-6909f272933e7527 --out-dir /Users/jan/Projects/rust-protobuf/target --dep-info /Users/jan/Projects/rust-protobuf/target/.fingerprint/protobuf-6909f272933e7527/dep-lib-protobuf -L /Users/jan/Projects/rust-protobuf/target -L /Users/jan/Projects/rust-protobuf/target/deps`
task 'rustc' panicked at 'assertion failed: *start <= *end', /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/build/src/libcore/slice.rs:396

stack backtrace:
   1:        0x109a0b619 - rt::backtrace::imp::write::h03fee16d4a0b6b41moq
   2:        0x109a0e85c - failure::on_fail::h3e0f6b3c6c4bbcc3VEq
   3:        0x109c6cf05 - unwind::begin_unwind_inner::h6c7f4532e72658d7SJd
   4:        0x109c6cb9f - unwind::begin_unwind_fmt::h9863b25c438d6314kHd
   5:        0x109c6c8f2 - rust_begin_unwind
   6:        0x109cc353c - panicking::panic_fmt::hc53a414d3d53805bi7j
   7:        0x109cb9f6f - panicking::panic::h5cf45d77d6cb56acm4j
   8:        0x106c0283b - middle::typeck::check::vtable::check_object_safety::h3ee32f70bc2a6910cvN
   9:        0x106c6cc5b - middle::typeck::check::FnCtxt<'a, 'tcx>::register_unsize_obligations::hcb6b97efb60320deqbX
  10:        0x106c6caf0 - middle::typeck::check::FnCtxt<'a, 'tcx>::register_autoref_obligations::hd570a6511af03072oaX
  11:        0x106c6cb11 - middle::typeck::check::FnCtxt<'a, 'tcx>::register_autoref_obligations::hd570a6511af03072oaX
  12:        0x106c48847 - middle::typeck::check::FnCtxt<'a, 'tcx>::write_adjustment::h33cb2b16f4b43377s7W
  13:        0x106c3988b - middle::typeck::check::FnCtxt<'a, 'tcx>::mk_assignty::h6874effc3ee97aa8hpX
  14:        0x106c39622 - middle::typeck::check::demand::coerce::h76915b0b074cd833BJR
  15:        0x106c9a109 - middle::typeck::check::check_expr_coercable_to_type::closure.132402
  16:        0x106c920f6 - middle::typeck::check::check_expr_with_unifier::h153e2ccf9b0cb061XCY
  17:        0x106c90501 - middle::typeck::check::check_argument_types::h6f5570c4fc68686bS3X
  18:        0x106c96bb4 - middle::typeck::check::check_expr_with_unifier::h153e2ccf9b0cb061XCY
  19:        0x106c5e2d1 - middle::typeck::check::check_block_with_expected::heb9a0fb2300c4559PJ0
  20:        0x106c59d42 - middle::typeck::check::check_fn::h0449d63e5b4f3e3a9oV
  21:        0x106c5926f - middle::typeck::check::check_bare_fn::hf2de12c52654551eoeV
  22:        0x106c60a10 - middle::typeck::check::check_method_body::h41f873f9bc8553cbhJV
  23:        0x106c5534b - middle::typeck::check::check_item::hfaeea23703d7dd28xyV
  24:        0x106c58942 - visit::Visitor::visit_mod::h5804396625110068135
  25:        0x106c57490 - visit::walk_item::h5035255892352898114
  26:        0x106c590ca - middle::typeck::check::check_item_types::haaff85b74e988d92ydV
  27:        0x10676f556 - util::common::time::h11920059333862041717
  28:        0x106f1959e - middle::typeck::check_crate::h50fcc5c8b39993f4LVn
  29:        0x106f81bcf - driver::driver::phase_3_run_analysis_passes::h1425a4ca465c7b097DA
  30:        0x106f7c2b8 - driver::driver::compile_input::h60bc42ef7fabbfd4SkA
  31:        0x106ff9ca8 - driver::run_compiler::h4031243f49082a9fw7D
  32:        0x106ff7ece - driver::run::closure.145349
  33:        0x10678781b - task::TaskBuilder<S>::try_future::closure.103709
  34:        0x106787713 - task::TaskBuilder<S>::spawn_internal::closure.103680
  35:        0x10670998d - task::NativeSpawner.Spawner::spawn::closure.8526
  36:        0x109cd320c - rust_try_inner
  37:        0x109cd31f6 - rust_try
  38:        0x109c6a677 - unwind::try::hab84862d0081b274cyd
  39:        0x109c6a50c - task::Task::run::h39093ecd59554b49ZJc
  40:        0x1067097b3 - task::NativeSpawner.Spawner::spawn::closure.8463
  41:        0x109c6bd37 - thread::thread_start::h589be8c0a398d299e5c
  42:     0x7fff89c842fc - _pthread_body
  43:     0x7fff89c84279 - _pthread_body

The code which led to this is available at jansegre/rust-protobuf#21e7e46

Thanks for the report! Closing as a dupe of #18490, feel free to track that issue for progress on it (in fact, I believe a fix for it is just about to land).