1 error[E0277]: the trait bound `impl Future: Copy` is not satisfied
2 --> $DIR/issue-55872-2.rs:14:14
4 LL | type E = impl std::marker::Copy;
5 | ^^^^^^^^^^^^^^^^^^^^^^ the trait `Copy` is not implemented for `impl Future`
7 error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
8 --> $DIR/issue-55872-2.rs:16:28
10 LL | fn foo<T>() -> Self::E {
11 | ____________________________^
17 error: aborting due to 2 previous errors
19 For more information about this error, try `rustc --explain E0277`.