[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:

I just want to point out one difference between _PyErr_ChainExceptions and PyErr_SetObject that I encountered while working on this issue:
https://bugs.python.org/issue40696

While both functions set the context, only PyErr_SetObject does a check to prevent cycles from forming in the context chain (albeit an incomplete check, which can lead to hangs, which I mention in the issue linked above).

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