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Catalog C# 9 diagnostics#52831

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BillWagner wants to merge 3 commits intodotnet:mainfrom
BillWagner:add-new-diagnostic-codes
Open

Catalog C# 9 diagnostics#52831
BillWagner wants to merge 3 commits intodotnet:mainfrom
BillWagner:add-new-diagnostic-codes

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@BillWagner BillWagner commented Apr 1, 2026

This is just in prep for planning the tasks to add documentation for each of these.


Internal previews

📄 File 🔗 Preview link
docs/csharp/misc/sorry-we-don-t-have-specifics-on-this-csharp-error.md Coming in C# 15

This is just in prep for planning the tasks to add documentation for each of these.
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Pull request overview

This PR updates the “sorry we don’t have specifics” C# compiler error page to better catalog newer compiler diagnostics (notably C# 9), likely to support future planning for adding per-diagnostic documentation.

Changes:

  • Updates ms.date to 04/01/2026.
  • Reorganizes and annotates f1_keywords, including fixing the C# 7.3/8.0 boundary and adding categorization notes for C# 9 diagnostics.
  • Adds additional diagnostic groupings and codes under the “Coming in C# 15” area.

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