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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 |
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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.