checkSameType(t, ChanOf(SendDir, TypeOf(T1(1))), (chan<- T1)(nil))

	// check String form of ChanDir
	if crt.ChanDir().String() != "<-chan" {
		t.Errorf("chan dir: have %q, want %q", crt.ChanDir().String(), "<-chan")
	}
	if cst.ChanDir().String() != "chan<-" {
		t.Errorf("chan dir: have %q, want %q", cst.ChanDir().String(), "chan<-")
	}
}

func TestChanOfGC(t *testing.T) {
	done := make(chan bool, 1)