| #![feature(specialization)] //~ WARN the feature `specialization` is incomplete |
| |
| //@ 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 |
| } |
