Python 3 code with an identifier that has a non-spacing mark in it does not get tokenized by lib2to3 and will result in an exception thrown in the parsing process.

Parsing the attached file (badvar.py), results in `ParseError: bad token: type=58, value='̇', context=('', (1, 1))`

This happens because the Name pattern regular expression in lib2to3 is `r'\w+'` and the word character class doesn't contain non-spacing marks (and possible other [continuation characters allowed in Python 3 identifiers](https://docs.python.org/3/reference/lexical_analysis.html#identifiers)).

(reported by energizer in the Python IRC channel)