[issue11078] Have test___all__ check for duplicates

[SilentGhost]

SilentGhost <ghost.adh at gmail.com> added the comment:

At the moment test fails only for os module on windows. 

These are the offending names: putenv, spawnv, spawnve

The reason is that __all__ is extended with ntpath.__all__ and then again in the body of os.py (I'm not entirely sure how this could be fixed elegantly).

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<http://bugs.python.org/issue11078>
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