[issue28410] Add convenient C API for "raise ... from ..."

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

I don't know how it is related to issue23188. Maybe solving issue23188 will make _PyErr_ChainExceptions and the function proposed in this issue redundant. Or will make them simpler. But it looks to me that issue23188 is far from the completion.

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue28410>
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