jdm
commented
7 years ago $ RUST_BACKTRACE=1 cargo build --test enumerate
thread 'rustc' panicked at 'index out of bounds: the len is 8 but the index is 18446744073709551615', src/libcollections/vec.rs:1488
stack backtrace:
0: std::sys::imp::backtrace::tracing::imp::unwind_backtrace
1: std::panicking::default_hook::{{closure}}
2: std::panicking::default_hook
3: std::panicking::rust_panic_with_hook
4: std::panicking::begin_panic
5: std::panicking::begin_panic_fmt
6: rust_begin_unwind
7: core::panicking::panic_fmt
8: core::panicking::panic_bounds_check
9: rustc::ty::AdtDef::discriminant_for_variant
10: rustc_trans::mir::rvalue::<impl rustc_trans::mir::MirContext<'a, 'tcx>>::trans_rvalue
11: rustc_trans::mir::block::<impl rustc_trans::mir::MirContext<'a, 'tcx>>::trans_block
12: rustc_trans::mir::trans_mir
13: rustc_trans::trans_item::TransItem::define
14: rustc_trans::base::trans_crate
15: rustc_driver::driver::phase_4_translate_to_llvm
16: rustc_driver::driver::compile_input::{{closure}}
17: rustc_driver::driver::phase_3_run_analysis_passes::{{closure}}
18: rustc::ty::context::TyCtxt::create_and_enter
19: rustc_driver::driver::phase_3_run_analysis_passes
20: rustc_driver::driver::compile_input
21: rustc_driver::run_compiler
22: std::panicking::try::do_call
23: __rust_maybe_catch_panic
24: <F as alloc::boxed::FnBox<A>>::call_box
25: std::sys::imp::thread::Thread::new::thread_start
26: _pthread_body
27: _pthread_start
SimonSapin
eddyb
This appeared at some point between the 4/18 and 4/21 nightlies.