[3.6] bpo-33064: lib2to3: support trailing comma after *args and **kwargs (GH-6096) #6098
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New tests also added.
I also made the comments in line with the builtin Grammar/Grammar. PEP 306 was
withdrawn, Kees Blom's railroad program has been lost to the sands of time for
at least 16 years now (I found a python-dev post from people looking for it).
(cherry picked from commit b51f5de)
Co-authored-by: Łukasz Langa lukasz@langa.pl
https://bugs.python.org/issue33064