[issue20440] Use Py_REPLACE/Py_XREPLACE macros

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I do not understand why that issue was closed. Probably Py_SETREF is not the best name but this can be discussed. Adverse idea about Py_INCREF also looked questionable. But many people supported the introduction of a macro for safe replacement.

And now we see that sources contain 50 potential bugs which can be fixed either by using special macros or by manually inlining them.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue20440>
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