rust/tests/ui/traits/trait-implementation-restriction-5988.rs

// https://github.com/rust-lang/rust/issues/5988
//@ run-pass

trait B {
    fn f(&self);
}

trait T : B {
}

struct A;

impl<U: T> B for U {
    fn f(&self) { }
}

impl T for A {
}

fn main() {
    let a = A;
    let br = &a as &dyn B;
    br.f();
}