[issue27100] Attempting to use class with both __enter__ & __exit__ undefined yields __exit__ attribute error

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

Oh, how I missed this? I usually run tests with -Wa.

Since the patch is simple and fixes a regression introduced just before releasing beta 4, I'm fine with fixing it. We are trying to support tests warnings-free. Some buildbots can run tests with -We.

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<http://bugs.python.org/issue27100>
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