STINNER Victor <vstin...@python.org> added the comment:

> I've had to debug a segfault before only because the inline function 
> implicitly cast its arguments, and it was accessing a non-existent member. If 
> it were a macro it would access the struct member directly, and the compiler 
> would be able to catch that and warn me before runtime.

This is part of Python C API legacy and as I wrote, it's not going to change 
soon. The minor enhancement that we can do is to inject an assertion when 
Python is built in debug mode.

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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue47164>
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