| #![feature(specialization)] | |
| //@ check-pass | |
| trait Trait { | |
| type Assoc; | |
| } | |
| impl<T> Trait for T { | |
| default type Assoc = bool; | |
| } | |
| // This impl inherits the `Assoc` definition from above and "locks it in", or finalizes it, making | |
| // child impls unable to further specialize it. However, since the specialization graph didn't | |
| // correctly track this, we would refuse to project `Assoc` from this impl, even though that should | |
| // happen for items that are final. | |
| impl Trait for () {} | |
| fn foo<X: Trait<Assoc=bool>>() {} | |
| fn main() { | |
| foo::<()>(); // `<() as Trait>::Assoc` is normalized to `bool` correctly | |
| } |