[issue39943] Meta: Clean up various issues in C internals

[Ammar Askar]

Ammar Askar <ammar at ammaraskar.com> added the comment:

For sre.c, this is definitely a bug in MSVC, see:

* https://stackoverflow.com/questions/10403713/why-does-visual-c-warn-on-implicit-cast-from-const-void-to-void-in-c-but
* https://godbolt.org/z/BpMqA_


I'm trying to get rid of MSVC warnings to unblock https://github.com/python/cpython/pull/18532 so I'll make a pull request that adds explicit casts for this.

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nosy: +ammar2

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