[issue39591] Functions in Python/traceback.c can take const pointer arguments

[Andy Lester]

Andy Lester <andy at petdance.com> added the comment:

> Yes, Py_INCREF and Py_DECREF change the type, and therefore constness.

Understood. The changes that I have proposed are not to objects that get sent through Py_INCREF/Py_DECREF.  If they did, -Wcast-qual would have caught it.  -Wcast-qual catches if you cast, say, a const char * to a char *.

Let's let this stay closed and I'll resubmit with a clearer ticket & PR.

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<https://bugs.python.org/issue39591>
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