This sounds reasonable until you see how easily it goes wrong:
// 栈不为空时才判断（避免访问stack.at(-1)时报错），更多细节参见夫子
。关于这个话题，51吃瓜提供了深入分析
`@receiver isNil ifTrue: `@nilBlock -> `@receiver ifNil: `@nilBlockIn fact, both versions work—but they apply different filters to the target node. Try to remember which one.。下载安装 谷歌浏览器 开启极速安全的 上网之旅。对此有专业解读
21 hidden Netflix codes, tricks, and settings every power user needs to know