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

[Mark Shannon]

Mark Shannon <mark at hotpy.org> added the comment:

According to PEP 384 (Defining a Stable ABI) the thread state object is opaque, so we should be free to add or remove fields.

Nevertheless, I have added a new patch that simply moves the f_exc... fields from the frame object to the generator. It is not as efficient as the first patch, but at least it moves fields relevant only to generators into the generator object.

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Added file: http://bugs.python.org/file25177/exc_info2.patch

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