[issue10360] _weakrefset.WeakSet.__contains__ should not propagate TypeErrors

[Tres Seaver]

Tres Seaver <tseaver at agendaless.com> added the comment:

This fix needs backporting to the 3.1 and 2.7 branches as well.

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status: closed -> open

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<http://bugs.python.org/issue10360>
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