[issue18864] Implementation for PEP 451 (importlib.machinery.ModuleSpec)

[Brett Cannon]

Brett Cannon added the comment:

The test_module failure can be triggered by running test_importlib test_module. For some reason unittest's __spec__ gets set to one for the BuiltinImporter (and nothing else).

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue18864>
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