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6a07dd227d
Summary -- Fixes #17181. The cases being tested with multiple *keys* being equal are actually a slightly different error, more like the error for `MatchMapping` than like the other multiple assignment errors: ```pycon >>> match x: ... case Class(x=x, x=x): ... ... File "<python-input-249>", line 2 case Class(x=x, x=x): ... ^ SyntaxError: attribute name repeated in class pattern: x >>> match x: ... case {"x": 1, "x": 2}: ... ... File "<python-input-251>", line 2 case {"x": 1, "x": 2}: ... ^^^^^^^^^^^^^^^^ SyntaxError: mapping pattern checks duplicate key ('x') >>> match x: ... case [x, x]: ... ... File "<python-input-252>", line 2 case [x, x]: ... ^ SyntaxError: multiple assignments to name 'x' in pattern ``` This PR just stops the false positive reported in the issue, but I will quickly follow it up with a new rule (or possibly combined with the mapping rule) catching the repeated attributes separately. Test Plan -- New inline `test_ok` and updating the `test_err` cases to have duplicate values instead of keys. |
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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.