[issue23188] Provide a C helper function to chain raised (but not yet caught) exceptions

[Chris Jerdonek]

Chris Jerdonek <chris.jerdonek at gmail.com> added the comment:

> The documentation of PyErr_SetObject, PyErr_SetString et al should also be updated to mention exception chaining.

I just posted a PR to do the above:
https://github.com/python/cpython/pull/20329

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<https://bugs.python.org/issue23188>
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