[issue11078] Have test___all__ check for duplicates

[Ezio Melotti]

Ezio Melotti added the comment:

Attached an updated patch that also uses subtests to keep running all tests even in case of failure.
The patch also intentionally breaks a few __all__ to show how it works -- these changes should clearly be removed once the patch gets committed.

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nosy: +ezio.melotti
stage: needs patch -> patch review
versions: +Python 3.4 -Python 3.3
Added file: http://bugs.python.org/file29935/issue11078.diff

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