[issue36541] Make lib2to3 grammar better match Python, support the := walrus

[Gregory P. Smith]

Gregory P. Smith <greg at krypto.org> added the comment:

While I said i didn't care... and don't really want to... I found a reason to at least not omit pep-570 positional only arg parsing support give things like yapf still use it rather than forking their own copy.  PR testing.

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assignee:  -> gregory.p.smith
status: closed -> open

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