bpo-38631: Avoid Py_FatalError() in init_slotdefs() #18263
Merged
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Rename init_slotdefs() to _PyTypes_InitSlotDefs() and add a return
value of type PyStatus. The function is now called exactly once from
_PyTypes_Init(). Replace calls to init_slotdefs() with an assertion
checking that slotdefs is initialized.
https://bugs.python.org/issue38631