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Generator::rewind — 重置迭代器
如果迭代已经开始了,这里会抛出一个异常。
此函数没有参数。
没有返回值。
[#1] uther at somewherebetweennowhere dot net [2015-07-27 23:38:59]
I'm guessing the *only* purpose for this even existing is so that it is compatible with the Iterator interface o_O