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gh-145239: Specialize match syntax error for unary addition in pattern#145658
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mvanhorn wants to merge 1 commit intopython:mainfrom
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gh-145239: Specialize match syntax error for unary addition in pattern#145658mvanhorn wants to merge 1 commit intopython:mainfrom
mvanhorn wants to merge 1 commit intopython:mainfrom
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…patternAdd a specialized syntax error message when unary '+' is used in matchpatterns. Instead of the generic "invalid syntax", users now see:"cannot use unary '+' in a literal pattern".This applies to all pattern contexts: top-level, alternatives, sequences,class patterns, and mapping patterns.Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
python-cla-botbot commentedMar 9, 2026 • edited
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Shrey-N commentedMar 9, 2026 • edited
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Also@mvanhorn, Just a heads up, if you accept the |
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Fixes#145239.
Adds a specialized syntax error message when unary
+is used in match patterns. Instead of the generic "invalid syntax", users now see a clear message:"cannot use unary '+' in a literal pattern".This applies to all pattern contexts: top-level, alternatives, sequences, class patterns, and mapping patterns.
Changes
Grammar/python.gram: Addedinvalid_literal_patternrule that catches'+' NUMBERand raises the specialized errorParser/parser.c: Regenerated from grammarLib/test/test_syntax.py: Added doctest-style tests for all pattern contextsLib/test/test_patma.py: Added unit tests inTestSyntaxErrorsMisc/NEWS.d: Added NEWS entryExample
Before:
After:
This contribution was developed with AI assistance (Claude Code).
matchsyntax error for unary addition in pattern #145239