[issue20942] _frozen_importlib should not have a __file__ attribute

[Brett Cannon]

Brett Cannon added the comment:

It actually does break backwards-compatibility as an attribute will disappear on frozen modules for anyone who uses the imp API. While the chances of actually breaking someone's code is very small, there is still a chance. But I'm only -0 on backporting so other core devs could convince me that I'm being overly cautious.

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versions:  -Python 3.4

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<http://bugs.python.org/issue20942>
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