dt := New(ds).Elem()
	if st != dt.Type() {
		t.Errorf("StructOf returned %s, want %s", dt.Type(), st)
	}

	// This should not panic.
	_ = dt.Interface().(struct{ D1 })
}

func TestChanOf(t *testing.T) {
	// check construction and use of type not in binary
	type T string
	ct := ChanOf(BothDir, TypeOf(T("")))
	v := MakeChan(ct, 2)
	runtime.GC()
	v.Send(ValueOf(T("hello")))
	runtime.GC()