3 // pretty-expanded FIXME #23616
11 impl<A> T0 for S<A> { type O = A; }
14 // this looks okay but as we see below, `f` is unusable
15 fn m0<F: Fn(<Self as T0>::O) -> bool>(self, f: F) -> bool;
18 // complains about mismatched types: <S<A> as T0>::O vs. A
21 fn m0<F: Fn(<Self as T0>::O) -> bool>(self, f: F) -> bool { f(self.0) }