[issue11610] Improved support for abstract base classes with descriptors

[Darren Dale]

Darren Dale <dsdale24 at gmail.com> added the comment:

Patch addressing latest comments in review. Notable change: defines _PyObject_IsAbstract in object.c/object.h, rather than repeating the code in multiple files and functions.

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Added file: http://bugs.python.org/file23857/abc_descriptor.patch

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<http://bugs.python.org/issue11610>
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