t.Errorf("chan dir: have %q, want %q", cst.ChanDir().String(), "chan<-")
	}
}

func TestChanOfGC(t *testing.T) {
	done := make(chan bool, 1)
	go func() {
		select {
		case <-done:
		case <-time.After(5 * time.Second):
			panic("deadlock in TestChanOfGC")
		}
	}()

	defer func() {
		done <- true
	}()

	type T *uintptr
	tt := TypeOf(T(nil))