src/test/ui/impl-trait/issue-55872-2.rs

   1 // edition:2018
   2
   3 #![feature(type_alias_impl_trait)]
   4
   5 pub trait Bar {
   6     type E: Copy;
   7
   8     fn foo<T>() -> Self::E;
   9 }
  10
  11 impl<S> Bar for S {
  12     type E = impl std::marker::Copy;
  13     fn foo<T>() -> Self::E {
  14         //~^ ERROR type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
  15         //~| ERROR the trait bound `impl Future<Output = [async output]>: Copy` is not satisfied
  16         async {}
  17     }
  18 }
  19
  20 fn main() {}