Parse Python 3.9+ parenthesized context managers

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Since the upstream grammar for this is not LR(1), we abuse LALRPOP
macros and the Into/TryInto traits to build a cover grammar that
converts to either tuples or `with` items after additional validation.
It’s annoying and ugly, but something like this is basically our only
option short of switching to a more powerful parser algorithm.

Fixes #4145.

Signed-off-by: Anders Kaseorg <andersk@mit.edu>

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Anders Kaseorg 2022-12-11 02:55:56 -08:00

parent dec0bf571f

commit bfd847d04c

4 changed files with 2412 additions and 85 deletions

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