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ruff/crates/ruff_python_parser
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Brent Westbrook 835e31b3ff
Fix syntax error false positive on alternative `match` patterns (#21362) 
Summary
--

Fixes #21360 by using the union of names instead of overwriting them, as
Micha suggested originally on #21104.

This avoids overwriting the `n` name in the `Subscript` by the empty set
of names visited in the nested OR pattern before visiting the other arm
of the outer OR pattern.

Test Plan
--

A new inline test case taken from the issue
 		2025-11-10 10:51:51 -05:00
..
resources Fix syntax error false positive on alternative `match` patterns (#21362) 2025-11-10 10:51:51 -05:00
src Fix syntax error false positive on alternative `match` patterns (#21362) 2025-11-10 10:51:51 -05:00
tests Fix syntax error false positive on alternative `match` patterns (#21362) 2025-11-10 10:51:51 -05:00
CONTRIBUTING.md Update usage instructions and lockfile for py-fuzzer script (#20940) 2025-10-17 15:57:17 +01:00
Cargo.toml [ty] Add environment variable to dump Salsa memory usage stats (#18928) 2025-06-26 21:27:51 +00:00
README.md Add basic docs for the parser crate (#11199) 2024-04-29 17:08:07 +00:00

README.md

Ruff Python Parser

Ruff's Python parser is a hand-written recursive descent parser which can parse Python source code into an Abstract Syntax Tree (AST). It also utilizes the Pratt parsing technique to parse expressions with different precedence.

Try out the parser in the playground.

Python version support

The parser supports the latest Python syntax, which is currently Python 3.12. It does not throw syntax errors if it encounters a syntax feature that is not supported by the target-version. This will be fixed in a future release (see https://github.com/astral-sh/ruff/issues/6591).

Contributing

Refer to the contributing guidelines to get started and GitHub issues with the parser label for issues that need help.