ICE: Type parameter _/FnSpace.1 (_/FnSpace/1) out of range when substituting (root type=_)

[japaric]

STR

#![crate_type = "lib"]
#![feature(associated_types)]

trait From<Src> {
    type Result;

    fn from(src: Src) -> Self::Result;
}

trait To {
    fn to<Dst: From<Self>>(self) -> Dst::Result {
        From::from(self)
    }
}

Output

ice.rs:1:1: 1:1 error: internal compiler error: Type parameter `Result/FnSpace.1` (Result/FnSpace/1) out of range when substituting (root type=Result) substs=Substs[types=[[];[Self];[];[Dst]], regions=[[];[];[];[]]]
ice.rs:1 #![crate_type = "lib"]
         ^
note: the compiler unexpectedly panicked. 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' panicked at 'Box<Any>', /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/libsyntax/diagnostic.rs:129

stack backtrace:
   1:     0x7f20a6029f30 - rt::backtrace::imp::write::h6412f7a49a1f3feaxXx
   2:     0x7f20a602d300 - failure::on_fail::hddee9b01525d1cc0Uoy
   3:     0x7f20a5c6d6b0 - unwind::begin_unwind_inner::hedcb21b2885493daaNc
   4:     0x7f20a3348270 - unwind::begin_unwind::h8700464743899426751
   5:     0x7f20a33481f0 - diagnostic::SpanHandler::span_bug::hc71fab85126cb6e2HBF
   6:     0x7f20a413cac0 - middle::subst::SubstFolder<$u{27}a$C$$u{20}$u{27}tcx$GT$.TypeFolder$LT$$u{27}tcx$GT$::fold_ty::hd27de014609b6ac5QfX
   7:     0x7f20a428b470 - vec::Vec<T>.FromIterator<T>::from_iter::h1323722657915396377
   8:     0x7f20a428b310 - middle::subst::VecPerParamSpace<T>::map_enumerated::h18018577534444447539
   9:     0x7f20a428ace0 - middle::ty_fold::super_fold_substs::h17168085672544058693
  10:     0x7f20a42b34d0 - middle::ty::Generics<$u{27}tcx$GT$::to_bounds::h8c2e7348f302947fOc9
  11:     0x7f20a42c5700 - middle::ty::construct_parameter_environment::h3b663cbb00f0518cGwe
  12:     0x7f20a40e7c80 - middle::ty::ParameterEnvironment<$u{27}tcx$GT$::for_item::h5aac0d5e762c820fNw9
  13:     0x7f20a52cce60 - check::check_method_body::hf79a9ae86800a9d5cHk
  14:     0x7f20a52c1020 - check::check_item::h2fd7cea4c7d59b025wk
  15:     0x7f20a5525620 - check_crate::unboxed_closure.42755
  16:     0x7f20a5520330 - check_crate::h9dd101b38ed58fa5W3y
  17:     0x7f20a64817a0 - driver::phase_3_run_analysis_passes::h77e8562ce41cfd75Eta
  18:     0x7f20a6464b10 - driver::compile_input::h81ce80bbe914c387rba
  19:     0x7f20a6618b50 - run_compiler::h2d4853ffa824f88bAYb
  20:     0x7f20a660f790 - thunk::F.Invoke<A,$u{20}R$GT$::invoke::h7351313412113629600
  21:     0x7f20a60022e0 - thunk::F.Invoke<A,$u{20}R$GT$::invoke::h4423555442319517089
  22:     0x7f20a5c6be20 - task::Task::spawn_thunk::closure.5804
  23:     0x7f20a5cca9c0 - rust_try_inner
  24:     0x7f20a5cca9b0 - rust_try
  25:     0x7f20a5c6bf30 - unwind::try::h870bc6c90527a031rCc
  26:     0x7f20a5c6bcc0 - task::Task::run::h3063eac886af1b39tNb
  27:     0x7f20a5c6b430 - thunk::F.Invoke<A,$u{20}R$GT$::invoke::h3611139983400510208
  28:     0x7f20a5c6cd80 - thread::thread_start::h6cf2d96de299983bM4b
  29:     0x7f20a07aa250 - start_thread
  30:     0x7f20a5940589 - clone
  31:                0x0 - <unknown>

Version

rustc 0.13.0-nightly (2a231594c 2014-12-18 12:21:57 +0000)

cc @nick29581 @nikomatsakis