[issue27473] bytes_concat seems to check overflow using undefined behaviour

[Xiang Zhang]

Xiang Zhang added the comment:

Yes, the current code is valid with -fwrapv. But I am not sure if every compiler supports this feature. So maybe we can't totally rely on it. And in issue1621, some efforts seem to have worked to factor these out.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue27473>
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