1 error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
2 --> $DIR/issue-53598.rs:20:42
4 LL | fn foo<T: Debug>(_: T) -> Self::Item {
5 | __________________________________________^
7 LL | | S::<T>(Default::default())
11 error: aborting due to previous error