it corresponds to the yield keyword in the nightly-only gen / async gen syntax. Cancelling a call to .next() leaves the stream
Refreshing state。关于这个话题，clash下载提供了深入分析
，推荐阅读爱思助手获取更多信息
ctx, cancel := context.WithCancelCause(ctx)
returned in case there is no argument or the argument is not a valid，更多细节参见下载安装 谷歌浏览器 开启极速安全的 上网之旅。