ICE creating structs with default type parameters with identical names and types

[pythonesque]

#![feature(default_type_params)]

pub struct Foo<Bar = Bar>;

pub struct Baz(Foo);

fn main() {}

---

$ RUST_BACKTRACE=1 rustc foo.rs
foo.rs:5:16: 5:19 error: internal compiler error: Type parameter `Bar` (Bar/TypeSpace/0) out of range when substituting (root type=Bar)
foo.rs:5 pub struct Baz(Foo);
                        ^~~
note: the compiler hit an unexpected failure path. 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' failed at 'Box<Any>', /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/build/src/libsyntax/diagnostic.rs:113

stack backtrace:
   1:        0x10c01dda9 - rt::backtrace::imp::write::h189e19957ab9c695OLq
   2:        0x10c021077 - failure::on_fail::h03dc2437e5a88345n2q
   3:        0x10c28e395 - unwind::begin_unwind_inner::hf0bc25e3a9312068Jud
   4:        0x10b782267 - unwind::begin_unwind::h13550917712925122129
   5:        0x10b782200 - unwind::begin_unwind::h13550917712925122129
   6:        0x108ef3651 - middle::subst::SubstFolder<'a, 'tcx>.TypeFolder<'tcx>::fold_ty::h51d3eabd2d589326k7U
   7:        0x1092dd867 - middle::typeck::astconv::ast_path_substs::h17230674362159792950
   8:        0x1092f274a - middle::typeck::astconv::ast_path_to_ty::h9293039141781755470
   9:        0x1092da6ad - middle::typeck::astconv::ast_ty_to_ty::h10119988251165278301
  10:        0x10932b4c5 - middle::typeck::collect::convert_field::h2da86f9ee62891ddJBf
  11:        0x1092f574a - middle::typeck::collect::convert_struct::h2b7ee55df10ef64egtg
  12:        0x1092d0f9d - middle::typeck::collect::convert::h31420af36e1b2433Pgg
  13:        0x1092cae53 - middle::typeck::collect::collect_item_types::h500e21302badea5eGhf
  14:        0x108c47b96 - util::common::time::h17347838844167099674
  15:        0x109486e18 - middle::typeck::check_crate::h4a8150eb203da20bLVk
  16:        0x1094f1d6f - driver::driver::phase_3_run_analysis_passes::hb45292d67f60c7dbEvx
  17:        0x1094ebfb3 - driver::driver::compile_input::hcfe10250ad7929a4qcx
  18:        0x109572834 - driver::run_compiler::h3e10e2d15988f082J0A
  19:        0x109570966 - driver::run::closure.147488
  20:        0x108c612eb - task::TaskBuilder<S>::try_future::closure.101597
  21:        0x108c611d3 - task::TaskBuilder<S>::spawn_internal::closure.101568
  22:        0x108be379d - task::spawn_opts::closure.8528
  23:        0x10c2f595c - rust_try_inner
  24:        0x10c2f5946 - rust_try
  25:        0x10c28ba07 - unwind::try::h538ab1bff32c8080rjd
  26:        0x10c28b88c - task::Task::run::h756ab4c75afdd7bdCzc
  27:        0x108be35c2 - task::spawn_opts::closure.8467
  28:        0x10c28d24a - thread::thread_start::hf25b5002f28406f0NTc
  29:     0x7fff9469c899 - _pthread_body
  30:     0x7fff9469c72a - _pthread_struct_init

[flaper87]

This bug seems to be a duplicate of #18956

[frewsxcv]

Despite it looking like a duplicate, #18956 looks like its fixed, yet this is still an issue with the latest rust:

/tmp $ rustc hi.rs
hi.rs:5:16: 5:19 error: internal compiler error: Type parameter `Bar/TypeSpace.0` (Bar/TypeSpace/0) out of range when substituting (root type=Bar) substs=Substs[types=[[];[];[]], regions=[[];[];[]]]
hi.rs:5 pub struct Baz(Foo);
                       ^~~
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 'Box<Any>', /Users/rustbuild/src/rust-buildbot/slave/nightly-dist-rustc-mac/build/src/libsyntax/diagnostic.rs:129

/tmp $ rustc -Vv
rustc 1.0.0-nightly (157614249 2015-03-01) (built 2015-03-01)
binary: rustc
commit-hash: 157614249594f187f421cd97f928e64c5ab5c1fa
commit-date: 2015-03-01
build-date: 2015-03-01
host: x86_64-apple-darwin
release: 1.0.0-nightly