Jason R. Coombs <jar...@jaraco.com> added the comment:

I believe I encountered this issue today on Python 2.7.14 
(https://ci.appveyor.com/project/jaraco/jaraco-windows/build/31/job/lenh5l4dcmj137b9).
 In this case, I have an iterable (in itertools.imap) that raises a TypeError 
when evaluated, not a generator.

The issue doesn't happen on Python 3, where 'map' is used instead of 
itertools.imap.

Does this patch need to be extended to support any iterable?

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nosy: +jason.coombs

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<https://bugs.python.org/issue4806>
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