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ruby 的 Block 调用为什么用 yield 这个单词，这个单词本身的意思没有 invoke 的意思啊？想不明白，苦思好久了，真难受
业精于勤，荒于嬉;行成于思，毁于随。
Because Block is a coroutine, the term upcall from coroutine is yield.
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Because Block is a coroutine, the term upcall from coroutine is yield.