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

[Antoine Pitrou]

Antoine Pitrou added the comment:

> Is it possible Cython is still supporting pre-PEP-328 style implicit relative imports, even in Python 2.7+?

That might be the case.  I can't find anything in the Cython docs.  Stefan, could you shed a light?

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