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Propagate params to lambdas and local functions#79880

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jjonescz merged 14 commits intodotnet:mainfrom
jjonescz:LambdaParamsAttribute
Sep 18, 2025
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Propagate params to lambdas and local functions#79880
jjonescz merged 14 commits intodotnet:mainfrom
jjonescz:LambdaParamsAttribute

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@jjonescz jjonescz commented Aug 12, 2025

Fixes #79752.

@jjonescz jjonescz marked this pull request as ready for review August 13, 2025 12:47
@jjonescz jjonescz requested a review from a team as a code owner August 13, 2025 12:47
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AlekseyTs commented Aug 14, 2025 •
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Does VB have the same issue with lambdas? At the very least we should add tests if the scenario is relevant for VB, I think. #Closed

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jjonescz commented Aug 14, 2025 •
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VB doesn't support params in lambdas. And VB doesn't have local functions. So I don't think there are any relevant tests I can add.

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333fred commented Aug 14, 2025

I'd like more understanding of the scenario before proceeding with implementation changes.

@KubaZ2 KubaZ2 mentioned this pull request Aug 15, 2025
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AlekseyTs commented Aug 21, 2025 •
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Are we testing lambdas and local functions inside new extension methods? They undergo a special rewrite. #Closed

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@jjonescz jjonescz requested a review from a team September 3, 2025 08:47
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LGTM Thanks (commit 8)

@jjonescz jjonescz requested review from a team and AlekseyTs September 8, 2025 09:18
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AlekseyTs commented Sep 11, 2025 •
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Done with review pass (commit 12) #Closed

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AlekseyTs commented Sep 11, 2025 •
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Done with review pass (commit 13) #Closed

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AlekseyTs commented Sep 11, 2025 •
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Done with review pass (commit 14) #Closed

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AlekseyTs commented Sep 11, 2025 •
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Overall LGTM, but I'll wait for the breaking change approval before signing off. #Closed

@jjonescz jjonescz requested a review from AlekseyTs September 17, 2025 11:56
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jjonescz commented Sep 18, 2025

@AlekseyTs please take another look, the break was approved over email

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LGTM (commit 14)

@jjonescz jjonescz merged commit 0b2145c into dotnet:main Sep 18, 2025
24 checks passed
@jjonescz jjonescz deleted the LambdaParamsAttribute branch September 18, 2025 12:53
@dotnet-policy-service dotnet-policy-service bot added this to the Next milestone Sep 18, 2025
333fred added a commit that referenced this pull request Sep 18, 2025
@333fred
Merge remote-tracking branch 'upstream/main' into copilot/fix-77001
84dbe2c 
* upstream/main: (206 commits)
  Remove bogus xlf tag (#80357)
  Fix missing type argument checks
  Add tests
  Use dotnet run file for generating compiler code (#80248)
  Only restore based on assets file changes if the actual content changed (#80341)
  make expressionbody analyzer use semanticspananalysis (#80339)
  [EnC] Use ignoreAssemblyKey: false to resolve symbol keys (#80342)
  Properly populate ExportedType metadata table in presence of extension block. (#80311)
  Propagate `params` to lambdas and local functions (#79880)
  Change 17.15 to VS 2026 preview. (#80325)
  Improve virtualproject support for older .NET SDKs (#80324)
  Update dependencies from https://github.com/dotnet/dotnet build 283666 (#80344)
  Update dependencies from https://github.com/dotnet/arcade build 20250917.6 (#80343)
  Simplifying
  Fix tests
  Fix tests
  Fix introduce variable placement in top level statements
  move to immutable types in signature help
  move to immutable types in signature help
  Fix check
  ...
333fred added a commit to 333fred/roslyn that referenced this pull request Sep 18, 2025
@333fred
Merge remote-tracking branch 'upstream/main' into test-runtime-async
e13af0f 
* upstream/main: (31 commits)
  Remove bogus xlf tag (dotnet#80357)
  Fix missing type argument checks
  Add tests
  Use dotnet run file for generating compiler code (dotnet#80248)
  Only restore based on assets file changes if the actual content changed (dotnet#80341)
  make expressionbody analyzer use semanticspananalysis (dotnet#80339)
  [EnC] Use ignoreAssemblyKey: false to resolve symbol keys (dotnet#80342)
  Properly populate ExportedType metadata table in presence of extension block. (dotnet#80311)
  Propagate `params` to lambdas and local functions (dotnet#79880)
  Change 17.15 to VS 2026 preview. (dotnet#80325)
  Improve virtualproject support for older .NET SDKs (dotnet#80324)
  Update dependencies from https://github.com/dotnet/dotnet build 283666 (dotnet#80344)
  Update dependencies from https://github.com/dotnet/arcade build 20250917.6 (dotnet#80343)
  Simplifying
  Fix tests
  Fix tests
  Fix introduce variable placement in top level statements
  move to immutable types in signature help
  move to immutable types in signature help
  Fix check
  ...
@dotnet-bot dotnet-bot mentioned this pull request Sep 20, 2025
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@akhera99 akhera99 modified the milestones: Next, 18.0 P1, 18.0 P2 Sep 22, 2025
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@AlekseyTs AlekseyTs AlekseyTs approved these changes

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Area-Compilers breaking-change https://github.com/dotnet/sdk/blob/main/documentation/project-docs/breaking-change-guidelines.md

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ParamArrayAttribute and ParamCollectionAttribute missing for compiler generated symbols

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@jjonescz @AlekseyTs @333fred @jcouv @akhera99