[issue1692335] Fix exception pickling: Move initial args assignment to BaseException.__new__

[Tres Seaver]

Tres Seaver <tseaver at agendaless.com> added the comment:

The attached patch adds Mark's examples to test_pickle as a failing test.

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nosy: +tseaver
Added file: http://bugs.python.org/file17509/issue1692335-tests.patch

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