[issue20980] In multiprocessing.pool, ExceptionWithTraceback should derive from Exception

[Roundup Robot]

Roundup Robot added the comment:

New changeset df6a6951b2c9 by Richard Oudkerk in branch '3.4':
Issue #20980: Stop wrapping exception when using ThreadPool.
http://hg.python.org/cpython/rev/df6a6951b2c9

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nosy: +python-dev

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