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