[issue27473] bytes_concat seems to check overflow using undefined behaviour

[Martin Panter]

Martin Panter added the comment:

The patch looks correct to me.

Issue 1621 is open about the general problem of overflows.

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nosy: +martin.panter
stage: needs patch -> commit review
versions: +Python 2.7, Python 3.5

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