ICE when using associated types in gfx-rs

[kvark]

Steps to repro:

git clone https://github.com/gfx-rs/gfx-rs
cd gfx-rs
wget https://gist.github.com/kvark/d58189f825f2aeb6ac25/raw/968557e154c2a18950d126bb996f390b34428419/gfx-associated-types.patch
patch -p1 <gfx-associated-types.patch
RUST_BACKTRACE=1 cargo build

Output:

Compiling gfx v0.1.0 (file:///mnt/code/3d/gfx-rs)
ERROR:rbml::reader: failed to find block with tag 1
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at 'explicit failure', /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/librbml/lib.rs:247

stack backtrace:
   1:     0x7f99f26b6360 - rt::backtrace::imp::write::hdbb48f4c53a7cc60gDq
   2:     0x7f99f26b94f0 - failure::on_fail::h664e14eeb2ff8c0bDYq
   3:     0x7f99f6e51900 - unwind::begin_unwind_inner::h810872eb101799beGxd
   4:     0x7f99f3365830 - unwind::begin_unwind::h14577076525426096402
   5:     0x7f99f3364870 - reader::get_doc::h34b9fee462c727a7RQa
   6:     0x7f99f7d521a0 - metadata::decoder::item_name::h065e40376150a870Pis
   7:     0x7f99f7d59fe0 - metadata::decoder::get_trait_item_name_and_kind::hcd0b77ba18b4f323DPs
   8:     0x7f99f77d9db0 - middle::resolve::Resolver<'a>::build_reduced_graph_for_external_crate_def::h91ada62ec8bccd47VOH
   9:     0x7f99f77dd690 - middle::resolve::Resolver<'a>::populate_external_module::closure.120614
  10:     0x7f99f7d56ec0 - metadata::decoder::each_child_of_item_or_crate::closure.142110
  11:     0x7f99f3365ea0 - reader::tagged_docs::h6d9e7a813995bf589Xa
  12:     0x7f99f7d56b90 - metadata::decoder::each_child_of_item_or_crate::h80a59bba09bd7674Eus
  13:     0x7f99f7d57df0 - metadata::decoder::each_child_of_item::hd56a96f9c5f9536esBs
  14:     0x7f99f77dd440 - metadata::csearch::each_child_of_item::hcf6fba917e21703bS0u
  15:     0x7f99f77dd890 - middle::resolve::Resolver<'a>::populate_module_if_necessary::he8010b784c77a28fL3H
  16:     0x7f99f78081e0 - middle::resolve::Resolver<'a>::resolve_definition_of_name_in_module::hf0b8aa7c1822c9a1UPM
  17:     0x7f99f7802a40 - middle::resolve::Resolver<'a>::resolve_path::h3d7dd52242dd1924KMM
  18:     0x7f99f77ff270 - middle::resolve::Resolver<'a>::resolve_trait_reference::h402b805e21bd9de7ZFL
  19:     0x7f99f77fc2e0 - middle::resolve::Resolver<'a>::resolve_type_parameters::h8a979e9b77aae05aXAL
  20:     0x7f99f7802300 - middle::resolve::Resolver<'a>::resolve_function::closure.121359
  21:     0x7f99f77d7d80 - middle::resolve::Resolver<'a>::with_type_parameter_rib::h86e4a332a99093b1OpL
  22:     0x7f99f77fff40 - middle::resolve::Resolver<'a>::resolve_function::h22b0d2a33d4e73feAvL
  23:     0x7f99f77ff8e0 - middle::resolve::Resolver<'a>::resolve_method::h86ca86fa7b1a55c5nOL
  24:     0x7f99f7806430 - middle::resolve::Resolver<'a>::resolve_implementation::closure.121399
  25:     0x7f99f78062f0 - middle::resolve::Resolver<'a>::with_current_self_type::h17301777680080738788
  26:     0x7f99f7805dd0 - middle::resolve::Resolver<'a>::resolve_implementation::closure.121393
  27:     0x7f99f77d7d80 - middle::resolve::Resolver<'a>::with_type_parameter_rib::h86e4a332a99093b1OpL
  28:     0x7f99f77bba70 - middle::resolve::Resolver<'a>.Visitor<'v>::visit_item::h04b6473cdf0352a8G6F
  29:     0x7f99f77fae30 - visit::Visitor::visit_mod::h3717781391814223201
  30:     0x7f99f7811430 - middle::resolve::resolve_crate::h25accb75d8c796c8lkO
  31:     0x7f99f7d8eb80 - driver::driver::phase_3_run_analysis_passes::hd7948c48dc1857d4Ptx
  32:     0x7f99f7d88ec0 - driver::driver::compile_input::h840323360e6605caBax
  33:     0x7f99f7e15b00 - driver::run_compiler::h7b2b99e1f7744388UYA
  34:     0x7f99f7e159b0 - driver::run::closure.147450
  35:     0x7f99f74d4770 - task::TaskBuilder<S>::try_future::closure.101573
  36:     0x7f99f74d4550 - task::TaskBuilder<S>::spawn_internal::closure.101544
  37:     0x7f99f719c690 - task::spawn_opts::closure.8447
  38:     0x7f99f6eabf00 - rust_try_inner
  39:     0x7f99f6eabef0 - rust_try
  40:     0x7f99f6e4f1c0 - unwind::try::h556dfbdc1d8ffbecomd
  41:     0x7f99f6e4f040 - task::Task::run::ha0065cc018d875382Bc
  42:     0x7f99f719c3d0 - task::spawn_opts::closure.8387
  43:     0x7f99f6e50910 - thread::thread_start::h340c482110725cecdWc
  44:     0x7f99f1a5f250 - start_thread
  45:     0x7f99f6b293b9 - clone
  46:                0x0 - <unknown>

Could not compile `gfx`.

[tomjakubowski]

Smaller reproduction with rustc 0.13.0-dev (b825b3496 2014-11-20 10:01:42 +0000):

// bar.rs
#![crate_type="lib"]
#![feature(associated_types)]

pub trait Bar {
    type T;
}

// foo.rs
#![crate_type="lib"]
#![feature(associated_types)]

extern crate bar;

pub use bar::Bar;

Then trying to compile foo.rs gives the same ICE and backtrace.

[nikomatsakis]

I've got a fix for this narrow issue, but when I broaden the test just a smidgen I encounter a few more issues. Patches forthcoming.