| // revisions: any_lt static_lt |
| //[static_lt] 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(with_negative_coherence)] |
| |
| trait Foo {} |
| |
| impl<T> !Foo for &'static T {} |
| |
| trait Bar {} |
| |
| impl<T> Bar for T where T: Foo {} |
| |
| #[cfg(any_lt)] |
| impl<T> Bar for &T {} |
| //[any_lt]~^ ERROR conflicting implementations of trait `Bar` for type `&_` |
| |
| #[cfg(static_lt)] |
| impl<T> Bar for &'static T {} |
| |
| |
| fn main() {} |
