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[syntax-errors] Detect duplicate keys in match mapping patterns (#17129)

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Summary
--

Detects duplicate literals in `match` mapping keys.

This PR also adds a `source` method to `SemanticSyntaxContext` to
display the duplicated key in the error message by slicing out its
range.

Test Plan
--

New inline tests.
This commit is contained in:
Brent Westbrook 2025-04-03 10:22:37 -04:00 • committed by GitHub
parent ca0cce3f9c
commit 6e2b8f9696
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7 changed files with 1298 additions and 6 deletions
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crates/ruff_python_parser/resources/inline/ok/duplicate_match_key_attr.py Normal file
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@ -0,0 +1,2 @@
match x:
case {x.a: 1, x.a: 2}: ...