[issue36922] Implement Py_TPFLAGS_METHOD_DESCRIPTOR

[Jeroen Demeyer]

Change by Jeroen Demeyer <J.Demeyer at UGent.be>:


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keywords: +patch
pull_requests: +13250
stage:  -> patch review

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36922>
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