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

[Gregory P. Smith]

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

Parsing support for `f(**mapping)` support is indeed still missing.

as lib2to3 is pending deprecation at this point, i'm not going to work on this.  anyone is welcome to pick it up.  modifying the lib2to3 grammar, and any related code, and adding a test is what's needed to parse that syntax.

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assignee: gregory.p.smith -> 
stage: patch review -> needs patch
versions: +Python 3.10 -Python 3.7

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