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 }