[issue13897] Move fields relevant to sys.exc_info out of frame into generator/threadstate

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

This looks rather good on the principle. I think PyExcState needn't be public, it should be _PyExcState.
I haven't checked the detailed mechanics of the patch, I hope someone else can.

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nosy: +pitrou

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<http://bugs.python.org/issue13897>
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