2 // A basic test of using a higher-ranked trait bound.
5 fn call(&self, arg: A) -> R;
8 type FnObject<'b> = dyn for<'a> FnLike<(&'a i32,), &'a i32> + 'b;
12 impl<'a, T> FnLike<(&'a T,), &'a T> for Identity {
13 fn call(&self, (arg,): (&'a T,)) -> &'a T {
18 fn call_repeatedly(f: &FnObject) {
20 let y = f.call((&x,));
25 call_repeatedly(&Identity);