ICE - compute_bounds(): resolve didn't resolve the type parameter identifier in a `where` clause

[comex]

trait Tr {}
type Huh<T> where T: Tr = isize;
fn main() {}

results in:

error: internal compiler error: unexpected failure
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 'compute_bounds(): resolve didn't resolve the type parameter identifier in a `where` clause', /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/build/src/libcore/option.rs:315

[steveklabnik]

hello.rs:2:22: 2:24 error: internal error looking up a definition
hello.rs:2 type Huh<T> where T: Tr = int;
                                ^~

[jooert]

Seems to be the same as #22471, the internal error isn't exposed anymore, test added in #24979. The code example given here is now failing with

test.rs:2:27: 2:32 error: type parameter `T` is unused [E0091]
test.rs:2 type Huh<T> where T: Tr = isize;