import java.util.List;
import java.util.function.Function;

public class Issue1715 {

    static final class A {

        public A() {}

        public Object foo(Object o) {
            return o;
        }
    }

    private Observable<List<Function<Object, Object>>> test(A a) {
        return Observable.just(ImmutableList.of(a::foo));
    }

    static class Observable<F> {

        static <T> Observable<T> just(T param) {
            throw new RuntimeException();
        }
    }

    public abstract static class ImmutableList<E> implements List<E> {

        public static <E> ImmutableList<E> of(E element) {
            throw new RuntimeException();
        }
    }
}