管道是否能二次关闭？

题目来源： 百度 、shein

答案1：

关闭已关闭的通道

会引发panic: close of closed channel

//关闭一个已经关闭的管道
func main() {
    channel := make(chan int, 10)
    close(channel)
    close(channel)
}
/*[Output]: panic: close of closed channel */