[issue16845] warnings.simplefilter should validate input

[Berker Peksag]

Berker Peksag added the comment:

Here's a patch that uses the same approach as in issue 16382.

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components: +Library (Lib)
nosy: +berker.peksag
stage:  -> patch review
versions: +Python 3.5
Added file: http://bugs.python.org/file35773/issue16845.diff

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