rust/tests/ui/type-alias-impl-trait/issue-57700.stderr

error: type parameter `impl Deref<Target = Self>` is part of concrete type but not used in parameter list for the `impl Trait` type alias
  --> $DIR/issue-57700.rs:16:9
   |
LL |         self
   |         ^^^^

error: aborting due to 1 previous error