[issue9232] Allow trailing comma in any function argument list.

[Roundup Robot]

Roundup Robot added the comment:

New changeset 419ceb531bab by Robert Collins in branch 'default':
Issue #9232: Support trailing commas in function declarations.
https://hg.python.org/cpython/rev/419ceb531bab

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nosy: +python-dev

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<http://bugs.python.org/issue9232>
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