tests/ui/type-alias-impl-trait/issue-53598.stderr

error: type parameter `T` is part of concrete type but not used in parameter list for the `impl Trait` type alias
  --> $DIR/issue-53598.rs:19:31
   |
LL |     fn foo<T: Debug>(_: T) -> Self::Item {
   |                               ^^^^^^^^^^

error: aborting due to 1 previous error