[issue36541] Make lib2to3 grammar more closely match Python

[Lisa Roach]

Lisa Roach <lisaroach14 at gmail.com> added the comment:

I agree we should get lib2to3 up to date.

Looks like for *args and **kwargs there is issue33348 (this has a PR) and issue32496 (no PR) and related closed issue24791 and issue24176. 

Adding `:=` seems straighforward to me, as for the big change maybe @benjamin.peterson would be interested in commenting?

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nosy: +lisroach

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