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Add C# 10 diagnostics for lambda expression#52094

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BillWagner merged 10 commits intodotnet:mainfrom
BillWagner:lambda-expression-errors
Mar 5, 2026
Merged

Add C# 10 diagnostics for lambda expression#52094
BillWagner merged 10 commits intodotnet:mainfrom
BillWagner:lambda-expression-errors

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@BillWagner BillWagner commented Mar 5, 2026 •
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Fixes #51447

In addition, search for additional consolidation opportunities, and additional related errors and warnings that aren't documented, but should be included.

Finally, perform an edit pass to focus more on resolving the issues than diagnosing the cause.

Internal previews

📄 File 🔗 Preview link
docs/csharp/language-reference/compiler-messages/lambda-expression-errors.md Errors and warnings when using lambda expressions and anonymous functions
docs/csharp/language-reference/toc.yml docs/csharp/language-reference/toc
docs/csharp/misc/sorry-we-don-t-have-specifics-on-this-csharp-error.md Coming in C# 15

@BillWagner
Add stubs for the new errors
6be2947
@BillWagner
Additional consolidation
e463779 
Copilot found several new opportunities for consolication
@BillWagner
Additional missing error codes.
e257b34
@BillWagner
Add new errors in appropriate sections.
f0d9525
@BillWagner
Focus on resolution, not cause
818e12d 
Rewrite the sections to focus on hose to fix errors, rather than the cause of the errors,
@BillWagner
Final edit pass
6351a95
@BillWagner BillWagner requested a review from a team as a code owner March 5, 2026 16:48
Copilot AI review requested due to automatic review settings March 5, 2026 16:48
@dotnetrepoman dotnetrepoman bot added this to the March 2026 milestone Mar 5, 2026
Copilot AI reviewed Mar 5, 2026
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Copilot encountered an error and was unable to review this pull request. You can try again by re-requesting a review.

@BillWagner BillWagner requested a review from Copilot March 5, 2026 17:47
Copilot AI reviewed Mar 5, 2026
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Pull request overview

Copilot reviewed 22 out of 22 changed files in this pull request and generated 6 comments.

BillWagner and others added 2 commits March 5, 2026 14:06
@BillWagner
Apply suggestions from code review
045e30b 
Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>
@BillWagner
insert xref
13f4514
@BillWagner BillWagner requested a review from gewarren March 5, 2026 19:09
@BillWagner BillWagner merged commit ad6c28c into dotnet:main Mar 5, 2026
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@BillWagner BillWagner deleted the lambda-expression-errors branch March 5, 2026 20:34
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Copilot code review Copilot Copilot left review comments

@meaghanlewis meaghanlewis meaghanlewis approved these changes

@gewarren gewarren Awaiting requested review from gewarren

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csharp-diagnostics/subsvc csharp-errors-warnings/subsvc dotnet-csharp/svc lang-reference/subsvc

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March 2026

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[C# 10 diagnostics] New lambda expression and delegate type errors

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