[issue33012] Invalid function cast warnings with gcc 8 for METH_NOARGS

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

The following PRs fix warnings in casts to PyCFunction for method conventions different from METH_NOARGS, METH_O and
METH_VARARGS. PR 6748 does this for Argument Clinic generated code (all files except Tools/clinic/clinic.py are generated). PR 6749 does it for hand-written code. It also fixes few missed or new cases for METH_NOARGS.

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