ICE when using generics, associated types and necromantic copy/paste

[blabaere]

rustc panic !

I tried this code:

impl<TStream, TCtx> endpoint::Endpoint<TCtx> for Pipe<TStream> where 
    TStream : StepStream + 'static, 
    TCtx : endpoint::EndpointRegistrar + endpoint::EventSender<TEvent=pipe::Event> {

    //ICE appears when inserting the below method
    fn ready(&mut self, ctx: &mut Context<PipeEvt>, events: mio::EventSet) {
        self.apply(|s| s.ready(ctx, events))
    }

}

// Here everything is working fine but I'm not satisfied with the design
impl<T : StepStream> Endpoint<PipeCmd, PipeEvt> for Pipe<T> {
    fn ready(&mut self, ctx: &mut Context<PipeEvt>, events: mio::EventSet) {
        self.apply(|s| s.ready(ctx, events))
    }
    fn process(&mut self, ctx: &mut Context<PipeEvt>, cmd: PipeCmd) {
        match cmd {
            PipeCmd::Open      => self.apply(|s| s.open(ctx)),
            PipeCmd::Close     => self.apply(|s| s.close(ctx)),
            PipeCmd::Send(msg) => self.apply(|s| s.send(ctx, msg)),
            PipeCmd::Recv      => self.apply(|s| s.recv(ctx))
        }
    }
}

I expected to see this happen: compiler error, because it was a just a copy/paste and laziness to actually look at it.

Instead, this happened: ICE

Meta

rustc --version --verbose:

rustc 1.13.0-nightly (490189634 2016-08-20)
binary: rustc
commit-hash: 490189634b656dcca9e41e6b52093569c03bd4df
commit-date: 2016-08-20
host: x86_64-unknown-linux-gnu
release: 1.13.0-nightly

Backtrace:

thread 'rustc' panicked at 'called `Option::unwrap()` on a `None` value', ../src/libcore/option.rs:326
stack backtrace:
   1:     0x7feb52a5ade9 - std::sys::backtrace::tracing::imp::write::h482d45d91246faa2
   2:     0x7feb52a6b4dc - std::panicking::default_hook::_{{closure}}::h89158f66286b674e
   3:     0x7feb52a697e7 - std::panicking::default_hook::h9e30d428ee3b0c43
   4:     0x7feb52a69ff8 - std::panicking::rust_panic_with_hook::h2224f33fb7bf2f4c
   5:     0x7feb52a69e92 - std::panicking::begin_panic::hcb11a4dc6d779ae5
   6:     0x7feb52a69dc0 - std::panicking::begin_panic_fmt::h310416c62f3935b3
   7:     0x7feb52a69d41 - rust_begin_unwind
   8:     0x7feb52ad540f - core::panicking::panic_fmt::hc5789f4e80194729
   9:     0x7feb52ad533b - core::panicking::panic::h1953378f4b37b561
  10:     0x7feb5114f0dc - rustc_typeck::check::compare_method::compare_impl_method::_{{closure}}::h08bef90d287aed42
  11:     0x7feb510ab0f9 - rustc_typeck::check::compare_method::compare_impl_method::he3538453c2efe177
  12:     0x7feb510c0082 - rustc_typeck::check::check_impl_items_against_trait::hb105ca8bb42a0b3d
  13:     0x7feb510bd602 - rustc_typeck::check::check_item_type::hba3733559d49be1e
  14:     0x7feb510b5e4b - _<rustc_typeck..check..CheckItemTypesVisitor<'a, 'tcx> as rustc..hir..intravisit..Visitor<'tcx>>::visit_item::h369cacffbaa18923
  15:     0x7feb510b7d4b - rustc_typeck::check::check_item_types::h81e44a5d40f450fd
  16:     0x7feb5112f4c3 - rustc_typeck::check_crate::h8ec8b2f490f5dc28
  17:     0x7feb52e4ab03 - rustc_driver::driver::phase_3_run_analysis_passes::_{{closure}}::h45e03cee16dcf298
  18:     0x7feb52e17546 - rustc_driver::driver::phase_3_run_analysis_passes::hc0de40cea97d81a1
  19:     0x7feb52e03f02 - rustc_driver::driver::compile_input::hd9ecc57abd3cba85
  20:     0x7feb52e36756 - rustc_driver::run_compiler::h184264500271cc39
  21:     0x7feb52d7c8c2 - std::panicking::try::do_call::h17a7a17ad7240c5c
  22:     0x7feb52a79846 - __rust_maybe_catch_panic
  23:     0x7feb52d9626a - _<F as alloc..boxed..FnBox<A>>::call_box::h93f9128277b2964a
  24:     0x7feb52a67bb2 - std::sys::thread::Thread::new::thread_start::he0bf102845911132
  25:     0x7feb4ad80181 - start_thread
  26:     0x7feb526a247c - __clone
  27:                0x0 - <unknown>

[durka]

dupe of #35869

[Aatch]

Fixed by #35877