[issue40360] Deprecate lib2to3 (and 2to3) for future removal

[Guido van Rossum]

Guido van Rossum <guido at python.org> added the comment:

I guess the design space is wide open.

Does parso have to be pure Python? If not, we could generate C code like we do for CPython's parser. Now, that doesn't work for incremental parsing, but I did an alternative implementation that uses a stack machine, also in C, that's only 2x slower than the PEG parser. Maybe that could be adapted to incremental parsing (because it's a stack machine). Error recovery is still a research project (at least for me -- I'm actually reading papers :-).

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