| // known-bug: unknown |
| |
| // This fails because we currently perform negative coherence in coherence mode. |
| // This means that when looking for a negative predicate, we also assemble a |
| // coherence-unknowable predicate. Since confirming the negative impl has region |
| // obligations, we don't prefer the impl over the unknowable predicate |
| // unconditionally and instead flounder. |
| |
| #![feature(negative_impls)] |
| #![feature(rustc_attrs)] |
| #![feature(with_negative_coherence)] |
| |
| #[rustc_strict_coherence] |
| trait Foo {} |
| impl<T> !Foo for &T where T: 'static {} |
| |
| #[rustc_strict_coherence] |
| trait Bar {} |
| impl<T: Foo> Bar for T {} |
| impl<T> Bar for &T where T: 'static {} |
| |
| fn main() {} |
