Compiler panicked while executing cargo run

[Limeth]

The compiler panicked while I was refractoring some code.

I tried this code:

I don't know what exactly caused it.
This is the code that causes the panic.
Limeth/euclider@f2a750b
I then found this prevents the panic.
Limeth/euclider@6490490

I expected to see this happen: Compilation errors displayed.

Instead, this happened: Compiler panicked.

Meta

rustc --version --verbose:

Compiling euclider v0.16.0 (file:///home/limeth/workspace/rust/euclider)
rustc 1.13.0-nightly (499484f56 2016-08-18)
binary: rustc
commit-hash: 499484f56d336f4628a6fa016626beb3ef21ba81
commit-date: 2016-08-18
host: x86_64-unknown-linux-gnu
release: 1.13.0-nightly
    Finished debug [unoptimized + debuginfo] target(s) in 0.5 secs

Backtrace:

$ env RUST_BACKTRACE=1 RUST_NEW_ERROR_FORMAT=1 cargo run --release -- --scene scenes/4d.json
   Compiling euclider v0.16.0 (file:///home/limeth/workspace/rust/euclider)
warning[E0122]: trait bounds are not (yet) enforced in type definitions
   --> src/universe/entity/surface.rs:256:1
    |
256 | pub type PaletteBlendFunction<C: Blend<Color=C> + ComponentWise> =
    | ^

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 'called `Option::unwrap()` on a `None` value', ../src/libcore/option.rs:326
stack backtrace:
   1:     0x7f0f4e993629 - std::sys::backtrace::tracing::imp::write::h482d45d91246faa2
   2:     0x7f0f4e9a3d1c - std::panicking::default_hook::_{{closure}}::h89158f66286b674e
   3:     0x7f0f4e9a2027 - std::panicking::default_hook::h9e30d428ee3b0c43
   4:     0x7f0f4e9a2838 - std::panicking::rust_panic_with_hook::h2224f33fb7bf2f4c
   5:     0x7f0f4e9a26d2 - std::panicking::begin_panic::hcb11a4dc6d779ae5
   6:     0x7f0f4e9a2600 - std::panicking::begin_panic_fmt::h310416c62f3935b3
   7:     0x7f0f4e9a2581 - rust_begin_unwind
   8:     0x7f0f4ea0daef - core::panicking::panic_fmt::hc5789f4e80194729
   9:     0x7f0f4ea0da1b - core::panicking::panic::h1953378f4b37b561
  10:     0x7f0f4d087f3c - rustc_typeck::check::compare_method::compare_impl_method::_{{closure}}::h08bef90d287aed42
  11:     0x7f0f4cfe4099 - rustc_typeck::check::compare_method::compare_impl_method::he3538453c2efe177
  12:     0x7f0f4cff8de2 - rustc_typeck::check::check_impl_items_against_trait::hb105ca8bb42a0b3d
  13:     0x7f0f4cff65a2 - rustc_typeck::check::check_item_type::hba3733559d49be1e
  14:     0x7f0f4cfeedeb - _<rustc_typeck..check..CheckItemTypesVisitor<'a, 'tcx> as rustc..hir..intravisit..Visitor<'tcx>>::visit_item::h369cacffbaa18923
  15:     0x7f0f4cff0ceb - rustc_typeck::check::check_item_types::h81e44a5d40f450fd
  16:     0x7f0f4d068323 - rustc_typeck::check_crate::h8ec8b2f490f5dc28
  17:     0x7f0f4ed82b03 - rustc_driver::driver::phase_3_run_analysis_passes::_{{closure}}::h45e03cee16dcf298
  18:     0x7f0f4ed4f546 - rustc_driver::driver::phase_3_run_analysis_passes::hc0de40cea97d81a1
  19:     0x7f0f4ed3bf02 - rustc_driver::driver::compile_input::hd9ecc57abd3cba85
  20:     0x7f0f4ed6e756 - rustc_driver::run_compiler::h184264500271cc39
  21:     0x7f0f4ecb48c2 - std::panicking::try::do_call::h17a7a17ad7240c5c
  22:     0x7f0f4e9b2086 - __rust_maybe_catch_panic
  23:     0x7f0f4ecce26a - _<F as alloc..boxed..FnBox<A>>::call_box::h93f9128277b2964a
  24:     0x7f0f4e9a03f2 - std::sys::thread::Thread::new::thread_start::he0bf102845911132
  25:     0x7f0f46cb9183 - start_thread
  26:     0x7f0f4e5db37c - clone
  27:                0x0 - <unknown>

error: Could not compile `euclider`.

To learn more, run the command again with --verbose.

[Limeth]

I updated the issue with a correct link, sorry for the confusion.

[Limeth]

This fixed the panic: Limeth/euclider@6490490

[TimNN]

Duplicate of #35869

[Limeth]

Thanks for investigating.