tests/ui/type-alias-impl-trait/issue-89952.rs

   1 // check-pass
   2
   3 #![feature(impl_trait_in_assoc_type)]
   4
   5 trait SomeTrait {}
   6 impl SomeTrait for () {}
   7
   8 trait MyFuture {
   9     type Output;
  10 }
  11 impl<T> MyFuture for T {
  12     type Output = T;
  13 }
  14
  15 trait ReturnsFuture {
  16     type Output: SomeTrait;
  17     type Future: MyFuture<Output = Result<Self::Output, ()>>;
  18     fn func() -> Self::Future;
  19 }
  20
  21 struct Foo;
  22
  23 impl ReturnsFuture for Foo {
  24     type Output = impl SomeTrait;
  25     type Future = impl MyFuture<Output = Result<Self::Output, ()>>;
  26     fn func() -> Self::Future {
  27         Result::<(), ()>::Err(())
  28     }
  29 }
  30
  31 fn main() {}