error[E0631]: type mismatch in function arguments
  --> $DIR/issue-43623.rs:14:5
   |
LL | / pub fn break_me<T, F>(f: F)
LL | | where T: for<'b> Trait<'b>,
LL | |       F: for<'b> FnMut(<T as Trait<'b>>::Assoc) {
LL | |     break_me::<Type, fn(_)>;
   | |     ^^^^^^^^^^^^^^^^^^^^^^^
   | |     |
   | |     expected signature of `for<'b> fn(<Type as Trait<'b>>::Assoc) -> _`
   | |     found signature of `fn(_) -> _`
LL | |
LL | |
LL | | }
   | |_- required by `break_me`

error[E0271]: type mismatch resolving `for<'b> <fn(_) as std::ops::FnOnce<(<Type as Trait<'b>>::Assoc,)>>::Output == ()`
  --> $DIR/issue-43623.rs:14:5
   |
LL | / pub fn break_me<T, F>(f: F)
LL | | where T: for<'b> Trait<'b>,
LL | |       F: for<'b> FnMut(<T as Trait<'b>>::Assoc) {
LL | |     break_me::<Type, fn(_)>;
   | |     ^^^^^^^^^^^^^^^^^^^^^^^ expected bound lifetime parameter 'b, found concrete lifetime
LL | |
LL | |
LL | | }
   | |_- required by `break_me`

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0271`.