// Test case for Issue 2190.
class Issue2190 {
    interface A<X extends B> {}

    abstract class B implements C {}

    interface C {}

    class D<T> {}

    interface I<T> {
        I<T> to(D<? extends T> x);
    }

    abstract class Z {
        void f(I<A<?>> x, D<? extends A<? extends C>> y) {
            x.to(y);
        }

        void g(I<A<? extends C>> x, D<? extends A<?>> y) {
            x.to(y);
        }
    }
}