public class Base
{
	public int Foo() => 42;
}

public class Test : Base
{
	static bool Check(Base p)
	{
		return p.Foo() == 42;
	}

	public static bool Run()
	{
		Test() o;
		Base b = o;
		Test p = o;
		Base b2;
		b2 = p;
		return b.Foo() == 42
			&& b2.Foo() == 42
			&& Check(o)
			&& Check(p);
	}
}