[issue39960] Using typename.__setattr__ in extension type with Py_TPFLAGS_HEAPTYPE is broken (hackcheck too eager?)

[Stefan Behnel]

Change by Stefan Behnel <stefan_ml at behnel.de>:


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versions:  -Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue39960>
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