ICE's on nightly rust: resolving bounds after type-checking

[bluss]

Reason is bug rust-lang/rust#43357

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error: internal compiler error: /checkout/src/librustc/infer/mod.rs:573: Encountered errors [FulfillmentError(Obligation(predicate=Binder(TraitPredicate(<K as kernel::GemmKernel>)),depth=0),Unimplemented)] resolving bounds after type-checking

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: rustc 1.21.0-nightly (599be0d18 2017-07-26) running on x86_64-unknown-linux-gnu

[bluss]

Fixed with rustc 1.21.0-nightly (126321e2e 2017-07-28)