vsintegration-ide-debugging

# VS Integration Debugging ## Build `.\Build.cmd -c Debug` ## Run tests xUnit2 VS Extensibility — not `dotnet test`. ```powershell $runner = (Get-ChildItem "$env:NUGET_PACKAGES\xunit.runner.console" -Recurse -Filter xunit.console.exe | Where-Object { $_.FullName -like '*net472*' } | Select-Object -First 1).FullName & $runner artifacts\bin\FSharp.Editor.IntegrationTests\Debug\net472\FSharp.Editor.IntegrationTests.exe -parallel none -nologo ``` ## Key paths - Tests + infra: `vsintegration/tests/FSharp.Editor.IntegrationTests/` - Sequence point emit: `src/Compiler/CodeGen/IlxGen.fs` → `EmitDebugPoint`, `EnsureNopBetweenDebugPoints` - PDB writer: `src/Compiler/AbstractIL/ilwritepdb.fs` - Collection lowering: `src/Compiler/Optimize/LowerComputedCollections.fs` - Local compiler setup: `UseLocalCompiler.Directory.Build.props` ## Core rule VS debugger binds breakpoints only at **stack-empty** IL offsets. Move the sequence point — never add runtime instructions.