W io.Writer
	}

	s.W = os.Stdout
	v := Indirect(ValueOf(&s)).Field(0).Interface()
	if v != s.W.(any) {
		t.Error("Interface() on interface: ", v, s.W)
	}
}

func TestNilPtrValueSub(t *testing.T) {
	var pi *int
	if pv := ValueOf(pi); pv.Elem().IsValid() {
		t.Error("ValueOf((*int)(nil)).Elem().IsValid()")
	}
}

func TestMap(t *testing.T) {