[issue18383] test_warnings modifies warnings.filters when running with "-W default"

[Martin Panter]

Martin Panter added the comment:

I am inclined to go with Alex’s patch. I am uploading a new version of it, issue18383_avoid_dups_3.diff, which resolves conflicts with recent changes.

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versions:  -Python 3.4
Added file: http://bugs.python.org/file42937/issue18383_avoid_dups_3.diff

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