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

[Martin Panter]

Martin Panter added the comment:

issue18383_assert_warns_and_dups.patch fixes all my new test suite complaints, and removes the message about altering warnings.filters.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18383>
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