[issue25791] Raise an ImportWarning when __spec__.parent/__package__ isn't defined for a relative import

[Brett Cannon]

Brett Cannon added the comment:

Is Cython not defining actual module objects or working around types.ModuleType? I'm just trying to figure out how a Cython module is ending up in a place where the attributes that are set by PyModule_NewObject() aren't there (https://github.com/python/cpython/blob/ac5bbd43bc7b769c13ae0412cb28a3521f4d4ff1/Objects/moduleobject.c#L80).

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<http://bugs.python.org/issue25791>
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