1 #![feature(rustc_attrs)]
7 #[rustc_on_unimplemented = "an impl did not match: {A} {B} {C}"]
8 impl<A, B, C> Foo<A> for (A, B, C) {
13 Foo::<usize>::foo((1i32, 1i32, 1i32));
14 //~^ ERROR the trait bound `(i32, i32, i32): Foo<usize>` is not satisfied