[issue11494] Confusing error message from warnings.warn

[Éric Araujo]

Changes by Éric Araujo <merwok at netwok.org>:


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nosy: +brett.cannon
versions: +Python 3.1, Python 3.2, Python 3.3

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue11494>
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