[issue36541] Make lib2to3 grammar more closely match Python

[Tim Hatch]

Tim Hatch <tim at timhatch.com> added the comment:

Here's approximately what it would look like to do the big change now: https://github.com/python/cpython/compare/master...thatch:lib2to3-update-grammar (one test failing, and some helpers may need more test coverage)

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<https://bugs.python.org/issue36541>
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