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2cdf087d1f
* Allow underscores in numeric literals in lib2to3.
* Stricter literal parsing for Python 3.6 in lib2to3.pgen2.tokenize.
* Add test case for underscores in literals in Python 3.
(cherry picked from commit a6e395dffa)
In this directory: - py2_test_grammar.py -- test file that exercises most/all of Python 2.x's grammar. - py3_test_grammar.py -- test file that exercises most/all of Python 3.x's grammar. - infinite_recursion.py -- test file that causes lib2to3's faster recursive pattern matching scheme to fail, but passes when lib2to3 falls back to iterative pattern matching. - fixes/ -- for use by test_refactor.py