Add C# 11 list pattern diagnostics #50569
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These were added in C# 11.
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Pull request overview
This PR adds documentation for C# 11 list pattern diagnostics by consolidating six error codes (CS8978, CS8979, CS8980, CS8985, CS9013, CS9060) from the generic error page into the pattern-matching-warnings.md article. The changes reorganize the pattern matching documentation into clearer sections and perform a general editing pass on the content.
Key changes:
- Removes six error codes from the undocumented errors list
- Adds comprehensive documentation for list pattern errors, type pattern errors, and related diagnostics
- Restructures the pattern matching article with new sections for better organization
Reviewed changes
Copilot reviewed 4 out of 4 changed files in this pull request and generated 9 comments.
| File | Description |
|---|---|
| docs/csharp/misc/sorry-we-don-t-have-specifics-on-this-csharp-error.md | Removes CS8978, CS8979, CS8980, CS8985, CS9013, and CS9060 from the undocumented errors list |
| docs/csharp/language-reference/toc.yml | Updates displayName to include the newly documented error codes |
| docs/csharp/language-reference/compiler-messages/pattern-matching-warnings.md | Adds documentation for list pattern and type pattern errors, restructures content with new sections |
| .github/prompts/error-consolidation.md | Updates metadata to reflect current work on pattern-matching-warnings.md |
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Co-authored-by: Copilot <[email protected]>
gewarren
approved these changes
Dec 13, 2025
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Fixes #49594
While in this file, perform a general edit pass.
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