// Possible loops.
	{&loop1, &loop1, true},
	{&loop1, &loop2, true},
	{&loopy1, &loopy1, true},
	{&loopy1, &loopy2, true},
}

func TestTypeOf(t *testing.T) {
	// Special case for nil
	if typ := TypeOf(nil); typ != nil {
		t.Errorf("expected nil type for nil value; got %v", typ)
	}
	for _, test := range typeOfTests {
		v := ValueOf(test.a)