error[E0308]: mismatched types
  --> $DIR/higher-ranked-lifetime-error.rs:12:5
   |
LL |     assert_all::<_, &String>(id);
   |     ^^^^^^^^^^^^^^^^^^^^^^^^ one type is more general than the other
   |
   = note: expected trait `for<'a> <for<'a> fn(&'a String) -> &'a String {id} as FnMut<(&'a String,)>>`
              found trait `for<'a> <for<'a> fn(&'a String) -> &'a String {id} as FnMut<(&'a String,)>>`

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0308`.