[issue25612] nested try..excepts don't work correctly for generators

[Martin Panter]

Martin Panter added the comment:

Regarding the second bug, did you consider that the exception thrown to the generator can already have __context__ set?

try:
    try: raise ValueError("Context outside of generator")
    except ValueError as ex: raise SubError() from ex
except SubError as ex:
    coro.throw(ex)  # ex.__context__ is a ValueError

I guess either one context could trump the other, or we could to follow the chain of contexts and append the other chain at the end. Both these ideas seem a bit ugly though.

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nosy: +martin.panter

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue25612>
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