ICE: thread 'rustc' panicked at 'RefCell<T> already borrowed', ../src/libcore/cell.rs:444

[Evrey]

Travis-CI build failed, my local builds with a slightly older rustc nightly works just fine. This is the repository in question and the Travis-CI build log:

• Repo: https://github.com/Evrey/GBArs/tree/c48726c4b92913fdb3937770d26dedaeb57684a7
• Travis-CI Log: https://gist.github.com/Evrey/cdcf7f20bfefd1769faf6a39512503b1

rustc only seems to fail when compiling my gbars crate:

Compiling gbars v0.3.1 (file:///home/travis/build/Evrey/GBArs)
Running rustc src/main.rs --crate-name gbars --crate-type bin -g --cfg feature=\"default\" --out-dir /home/travis/build/Evrey/GBArs/target/debug --emit=dep-info,link -L dependency=/home/travis/build/Evrey/GBArs/target/debug -L dependency=/home/travis/build/Evrey/GBArs/target/debug/deps --extern term=/home/travis/build/Evrey/GBArs/target/debug/deps/libterm-585dc449d37783e7.rlib --extern byteorder=/home/travis/build/Evrey/GBArs/target/debug/deps/libbyteorder-79579e11a5fc0173.rlib --extern log=/home/travis/build/Evrey/GBArs/target/debug/deps/liblog-342ffb7444a9471d.rlib --extern argparse=/home/travis/build/Evrey/GBArs/target/debug/deps/libargparse-b299699413f65723.rlib
error: internal compiler error: unexpected panic

Could be related to #18711, a way older and closed issue. (rustc 0.13.0-dev)

Meta

Travis-CI (ICE)

$ rustc --version
rustc 1.9.0-nightly (bf5da36f1 2016-04-06)
$ cargo --version
cargo 0.10.0-nightly (f20ca62 2016-04-06)

Backtrace:

   1:     0x7f8cb4c54400 - std::sys::backtrace::tracing::imp::write::h714760a4c8c0cdd8
   2:     0x7f8cb4c61acb - std::panicking::default_hook::_$u7b$$u7b$closure$u7d$$u7d$::hff309ab1d83ffd90
   3:     0x7f8cb4c6166b - std::panicking::default_hook::h08ad3bb09872855b
   4:     0x7f8cb4c253ef - std::sys_common::unwind::begin_unwind_inner::h406d5f1a330b854b
   5:     0x7f8cb4c274d8 - std::sys_common::unwind::begin_unwind_fmt::h57ea3fbee1a40196
   6:     0x7f8cb4c51af1 - rust_begin_unwind
   7:     0x7f8cb4cab53f - core::panicking::panic_fmt::ha6b3c19493c123b3
   8:     0x7f8cb4cac038 - core::panicking::panic::h188c6c6a0fe5463c
   9:     0x7f8cb39fbfbe - rustc_resolve::resolve_imports::_<impl ModuleS<'a>>::try_define_child::hfd59dfd790ce27ba
  10:     0x7f8cb3a042d3 - rustc_resolve::resolve_imports::_<impl ModuleS<'a>>::define_in_glob_importers::h7043f8c562791a18
  11:     0x7f8cb39fbf62 - rustc_resolve::resolve_imports::_<impl ModuleS<'a>>::try_define_child::hfd59dfd790ce27ba
  12:     0x7f8cb3a042d3 - rustc_resolve::resolve_imports::_<impl ModuleS<'a>>::define_in_glob_importers::h7043f8c562791a18
  13:     0x7f8cb39fbf62 - rustc_resolve::resolve_imports::_<impl ModuleS<'a>>::try_define_child::hfd59dfd790ce27ba
  14:     0x7f8cb3a06674 - rustc_resolve::resolve_imports::ImportResolver::resolve_imports_in_current_module::hcd653de830737026
  15:     0x7f8cb3a043a7 - rustc_resolve::resolve_imports::ImportResolver::resolve_imports_for_module_subtree::hdf6b441d9816f5a2
  16:     0x7f8cb3a0442e - rustc_resolve::resolve_imports::ImportResolver::resolve_imports_for_module_subtree::hdf6b441d9816f5a2
  17:     0x7f8cb3a0442e - rustc_resolve::resolve_imports::ImportResolver::resolve_imports_for_module_subtree::hdf6b441d9816f5a2
  18:     0x7f8cb3a0442e - rustc_resolve::resolve_imports::ImportResolver::resolve_imports_for_module_subtree::hdf6b441d9816f5a2
  19:     0x7f8cb3a0442e - rustc_resolve::resolve_imports::ImportResolver::resolve_imports_for_module_subtree::hdf6b441d9816f5a2
  20:     0x7f8cb39f872e - rustc_resolve::resolve_crate::h6e88006253f832e0
  21:     0x7f8cb519d322 - rustc_driver::driver::phase_3_run_analysis_passes::h035bf2dff707c080
  22:     0x7f8cb517213f - rustc_driver::driver::compile_input::h650fe5b01cb8d74d
  23:     0x7f8cb5157f04 - rustc_driver::run_compiler::h68d23e0e9b7b247d
  24:     0x7f8cb5155371 - std::sys_common::unwind::try::try_fn::h67fde221a73148bc
  25:     0x7f8cb4c51a7b - __rust_try
  26:     0x7f8cb4c51a0d - std::sys_common::unwind::inner_try::h4e97625a08807651
  27:     0x7f8cb5155bba - _<F as std..boxed..FnBox<A>>::call_box::hc8936fa120642c49
  28:     0x7f8cb4c5fc54 - std::sys::thread::Thread::new::thread_start::h74af400293164137
  29:     0x7f8cacd8fe99 - start_thread
  30:     0x7f8cb48ac38c - <unknown>

Local compiler 1 (works)

C:\???>rustc --version --verbose
rustc 1.9.0-nightly (02310fd31 2016-03-19)
binary: rustc
commit-hash: 02310fd313cf3eed11fe5ac11921b73cc3b648d4
commit-date: 2016-03-19
host: x86_64-pc-windows-gnu
release: 1.9.0-nightly

C:\???>cargo --version --verbose
cargo 0.10.0-nightly (132b82d 2016-03-19)

Local compiler 2 (works)

E:\???>rustc --version --verbose
rustc 1.9.0-nightly (02310fd31 2016-03-19)
binary: rustc
commit-hash: 02310fd313cf3eed11fe5ac11921b73cc3b648d4
commit-date: 2016-03-19
host: i686-pc-windows-gnu
release: 1.9.0-nightly

E:\???>cargo --version --verbose
cargo 0.10.0-nightly (132b82d 2016-03-19)

[arielb1]

cc @jseyfried

[plumenator]

Related: arcnmx/cargo-clippy/issues/19