[issue43502] [C-API] Convert obvious unsafe macros to static inline functions

[Erlend Egeberg Aasland]

Change by Erlend Egeberg Aasland <erlend.aasland at innova.no>:


Added file: https://bugs.python.org/file49877/macros-that-reuse-args.txt

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<https://bugs.python.org/issue43502>
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