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[rust.git] / tests / ui / specialization / default-generic-associated-type-bound.rs
1 // Check that default generics associated types are validated.
2
3 #![feature(specialization)]
4 //~^ WARNING `specialization` is incomplete
5
6 trait X {
7     type U<'a>: PartialEq<&'a Self> where Self: 'a;
8     fn unsafe_compare<'b>(x: Option<Self::U<'b>>, y: Option<&'b Self>) {
9         match (x, y) {
10             (Some(a), Some(b)) => a == b,
11             _ => false,
12         };
13     }
14 }
15
16 impl<T: 'static> X for T {
17     default type U<'a> = &'a T;
18     //~^ ERROR can't compare `T` with `T`
19 }
20
21 struct NotComparable;
22
23 pub fn main() {
24     <NotComparable as X>::unsafe_compare(None, None);
25 }