The thing to notice about this wrapper is that each generator/coroutine yields a tuple that contains its intended branch destination.

关于这个包装器要注意的一点是，每个生成器／协同程序都会生成一个包含它的预期分支目标的元组。

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Pass in an action, function, method or coroutine.

传入一个动作，函数，方法或协程。

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Pass in an action, function, method or coroutine.

传入一个动作，函数，方法或协程。

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