[issue17413] format_exception() breaks on exception tuples from trace function

[Roundup Robot]

Roundup Robot added the comment:

New changeset d18df4c90515 by R David Murray in branch '3.3':
#17413: make sure settrace funcs get passed exception instances for 'value'.
http://hg.python.org/cpython/rev/d18df4c90515

New changeset 6297fcddf912 by R David Murray in branch 'default':
Merge #17413: make sure settrace funcs get passed exception instances for 'value'.
http://hg.python.org/cpython/rev/6297fcddf912

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nosy: +python-dev

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<http://bugs.python.org/issue17413>
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