[issue21377] PyBytes_Concat could try to concat in-place

[Nikolaus Rath]

Nikolaus Rath added the comment:

Tentative patch attached. The test suite still passes, but I'm not sure if it actually exerts the new code path. Is there a standard way to test the C api?

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keywords: +patch
Added file: http://bugs.python.org/file35084/issue_21377.diff

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