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今天看到一句对这个问题特别精辟的总结，记录如下：
It is possible to transfer into a block, but not in a way that bypasses declarations with initialization. A program that jumps from a point where a local variable with automatic storage duration is not in scope to a point where it is in scope is ill-formed unless the variable has POD type (3.9) and is declared without an initializer (8.5).
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原文地址：http://www.cnblogs.com/ptolemaeus/p/5955071.html
