What’s confusing is that you use the same syntax to create a Proc which can’t affect the control flow of the function that called it, and has the same limitations as other languages like Java. If you think about the implementation it makes sense, a yield cannot be stored and run later, outside of the execution of the method it is in, whereas a Proc can be stored as an instance variable and executed much later. Like, how would this work?
To be clear, copyright law isn’t a choose your own adventure book. There’s no such thing as a “dual copyright” regime under U.S. law—no parallel terms running simultaneously, no option to select whichever happens to be longer.
，详情可参考电影
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新国标并未纠结于车门把手是否“隐藏式”，而是要求必须可以机械释放，而且应该具有相应的手部操作空间。相较而言，同样攸关行车安全的车灯控制，是否也应做到至少保留手动机械控制的选项，这是值得慎重考虑的。系统工程界素有“安全冗余”的概念，强调在设备与制度层面设置双重乃至多重防护措施，尤其是在关键系统中保持备用系统或设备的标准配置。车灯、门把手等操纵件事关行车安全，理应留出安全冗余。