for {
			select {
			case i64 = <-c64:
				break Recv64
			default:
				try++
				if try > maxTries {
					panic("i64sender")
				}
				sleep()
			}
		}
		if i64 != 234567 {
			panic("i64sender value")
		}
		if buffer == 0 {
			<-sync
		}

		go breceiver(cb, sync)
		try = 0
	SendBool:
		for {
			select {
			case cb <- true:
				break SendBool
			default: