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Add modern F# idiom instructions for Copilot / Claude Code - #20399

#20399

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xperiandri wants to merge 9 commits into

dotnet:maindotnet/fsharp:mainfrom

xperiandri:modern-fsharp-copilot-instructionsxperiandri/fsharp:modern-fsharp-copilot-instructionsCopy head branch name to clipboard

Conversation Commits9 (9)Checks Files changed

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Add modern F# idiom instructions for Copilot / Claude Code#20399
xperiandri wants to merge 9 commits into
dotnet:mainfrom
xperiandri:modern-fsharp-copilot-instructions

Keep voption for fields and cross-thread values, and convert to optio…

6d5b844

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Repository lockdown check on: pull_request_target 1

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fsharp-ci

fsharp-ci (Build Build_And_Test_AOT_Windows classic_metadata)

fsharp-ci (Build Build_And_Test_AOT_Windows compressed_metadata)

fsharp-ci (Build CheckCodeFormatting)

fsharp-ci (Build Check_Published_Package_Versions FCS)

fsharp-ci (Build Check_Published_Package_Versions FSCore)

fsharp-ci (Build Chiron_Aether_Inline_SRTP Regression Test)

fsharp-ci (Build Determinism_Release)

fsharp-ci (Build EndToEndBuildTests)

fsharp-ci (Build FSharpDataGraphQL_DesignTimeProvider_Packaging Regression Test)

fsharp-ci (Build FSharpPlus_Linux Regression Test)

fsharp-ci (Build FSharpPlus_Windows Regression Test)

fsharp-ci (Build FsToolkit_ErrorHandling_Build Regression Test)

fsharp-ci (Build FsToolkit_ErrorHandling_Test_Debug Regression Test)

fsharp-ci (Build FsToolkit_ErrorHandling_Test_Release Regression Test)

fsharp-ci (Build FsharpPlus_NET10_Build_Lib_Tests Regression Test)

fsharp-ci (Build FsharpPlus_NET10_Docs Regression Test)

fsharp-ci (Build FsharpPlus_NET10_Test_Debug Regression Test)

fsharp-ci (Build FsharpPlus_NET10_Test_Release Regression Test)

fsharp-ci (Build FsharpPlus_Net10_Linux Regression Test)

fsharp-ci (Build ILVerify)

fsharp-ci (Build IcedTasks_Build Regression Test)

fsharp-ci (Build IcedTasks_Test_Debug Regression Test)

fsharp-ci (Build IcedTasks_Test_Release Regression Test)

fsharp-ci (Build LinqExpressionOptimizer_Test_Release Regression Test)

fsharp-ci (Build Linux)

fsharp-ci (Build MacOS Batch1)

fsharp-ci (Build MacOS Batch2)

fsharp-ci (Build MockOfficial)

fsharp-ci (Build Nu_Build Regression Test)

fsharp-ci (Build OpenTK_FSharp_Build Regression Test)

fsharp-ci (Build Oxpecker_Build Regression Test)

fsharp-ci (Build Oxpecker_Solid_Build Regression Test)

fsharp-ci (Build Plain_Build_Linux)

fsharp-ci (Build Plain_Build_MacOS)

fsharp-ci (Build Plain_Build_Windows)

fsharp-ci (Build Prime_Build Regression Test)

fsharp-ci (Build Source-Build (Managed))

fsharp-ci (Build Source-Build (Managed_MonoRuntime))

fsharp-ci (Build UMX_Slow_Repro Regression Test)

fsharp-ci (Build WindowsCompressedMetadata coreclr_release)

fsharp-ci (Build WindowsCompressedMetadata transparent_compiler_release)

fsharp-ci (Build WindowsCompressedMetadata vs_release)

fsharp-ci (Build WindowsCompressedMetadata_Desktop Batch1)

fsharp-ci (Build WindowsCompressedMetadata_Desktop Batch2)

fsharp-ci (Build WindowsCompressedMetadata_Desktop Batch3)

fsharp-ci (Build WindowsLangVersionPreview)

fsharp-ci (Build WindowsNoRealsig_testCoreclr)

fsharp-ci (Build WindowsNoRealsig_testDesktop)

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Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: peter-evans/find-comment@v2.4.0. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

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succeeded Sep 14, 2026 in 4s

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