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gh-133560: Clarified parser.md doc for pegen parser issue in using the existing Grammar/python.gram file. (GH-139194)

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Co-authored-by: Petr Viktorin <encukou@gmail.com>
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chemelnucfin
2026-05-01 01:11:53 -07:00
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@@ -819,6 +819,13 @@ directory on the CPython repository and manually call the parser generator by ex
$ python -m pegen python <PATH TO YOUR GRAMMAR FILE>
```
> [!CAUTION]
> Python's grammar (the `Grammar/python.gram` file) is written for the
> C backend. To experiment, you will need to write a grammar
> without C-specific parts like actions and the trailer.
> See [#133560](https://github.com/python/cpython/issues/133560)
> and [#96424](https://github.com/python/cpython/issues/96424) for more information.
This will generate a file called `parse.py` in the same directory that you
can use to parse some input: