error[E0582]: binding for associated type `Output` references an anonymous lifetime, which does not appear in the trait input types --> $DIR/issue-62200.rs:11:39 | LL | fn foo(x: impl Fn(>::A) -> >::A) {} | ^^^^^^^^^^^^^^^ | = note: lifetimes appearing in an associated or opaque type are not considered constrained = note: consider introducing a named lifetime parameter error: aborting due to previous error For more information about this error, try `rustc --explain E0582`.