[issue9330] assertIn should check for membership support before testing

[Brian Curtin]

Brian Curtin <curtin at acm.org> added the comment:

I knew there was a reason I was thinking my whole idea was slightly ridiculous...duh.

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resolution:  -> rejected
status: open -> closed

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue9330>
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