[issue2928] Allow set/frozenset for __all__

[Georg Brandl]

Georg Brandl <georg at python.org> added the comment:

You don't check for NULL return from PyObject_GetIter(). It will
segfault for "__all__ = 1".

That demonstrates that test cases are missing from the patch. :)

Raymond: It shouldn't since __all__ is only inspected after the module
code has been executed.

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nosy: +georg.brandl

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