[issue17482] functools.update_wrapper mishandles __wrapped__

[mike bayer]

mike bayer added the comment:

this is actually biting me, I think, though I'm having a very hard time getting a small Python script to duplicate it :/.   https://bitbucket.org/zzzeek/alembic/issue/175/test-suite-failure-under-python34 refers to the current problems I'm having.   I am not really familiar with the ramifications of __wrapped__ so I need to learn some more about that but also I'm concerned that a standalone test which attempts to simulate everything as much as possible is not doing the same thing.

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nosy: +zzzeek

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<http://bugs.python.org/issue17482>
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