type caseInfo struct {
	desc      string
	canSelect bool
	recv      Value
	closed    bool
	helper    func()
	panic     bool
}

var allselect = flag.Bool("allselect", false, "exhaustive select test")

func TestSelect(t *testing.T) {
	selectWatch.once.Do(func() { go selectWatcher() })

	var x exhaustive
	nch := 0