Issues

• Read editorconfig for all Razor formatting options

  Area-Razor
  dotnet/roslyn#86135 · Filter by author davidwengier opened on Oct 20, 2026 · 18.13
  

• [AI artifact audit] AI artifact audit: obsolete MCP tool names in skill docs

  dotnet/roslyn#86125 · Filter by author github-actions opened on Oct 19, 2026
  

• Microsoft.CodeAnalysis.BuildTasks.UnitTests.RuntimeHostInfoTests.DotNetInPath_Symlinked fails locally for net472

  Test
  dotnet/roslyn#86124 · Filter by author AlekseyTs opened on Oct 19, 2026

• Intermittent bootstrap compiler analyzer inconsistency in correctness build

  Known Build Error
  dotnet/roslyn#86123 · Filter by author jaredpar opened on Oct 19, 2026

• Support attributes on individual C# union cases

  dotnet/roslyn#86121 · Filter by author eiriktsarpalis opened on Oct 19, 2026

• [Known Build Error] FileBasedProgramsWorkspaceTests (Expected: "Host", Actual: "MiscellaneousFiles")

  Area-IDEblocking-clean-ciFeature - Run FileKnown Build Error
  dotnet/roslyn#86118 · Filter by author build-insights opened on Oct 19, 2026

• Task List omits project for TODO comments in Razor markup

  Area-Razor
  dotnet/roslyn#86104 · Filter by author vsfeedback opened on Oct 19, 2026 · 18.13
  

• Speculative binding throws KeyNotFoundException for a task-returning local function named Main in top-level statements

  Area-CompilersFeature - Local Functions
  Bug

  dotnet/roslyn#86103 · Filter by author meziantou opened on Oct 19, 2026 · 18.13
  

• Parser drops text before implicit operator, so the syntax tree is shorter than the source text

  Area-Compilers
  Bug

  dotnet/roslyn#86102 · Filter by author meziantou opened on Oct 18, 2026 · Backlog
  

• NullReferenceException in SourceMethodSymbol.ImplementationAttributes for an async lambda in an assembly attribute, then GetDiagnostics hangs

  Area-CompilersFeature - Nullable Reference Types
  Bug

  dotnet/roslyn#86101 · Filter by author meziantou opened on Oct 18, 2026 · Backlog
  

• AnalyzeDataFlow should succeed when the region is the receiver of an instance method call

  Area-Compilers
  Bug

  dotnet/roslyn#86099 · Filter by author nurullahturkoglu opened on Oct 17, 2026 · 18.13
  

• dotnet format whitespace leaves documentation comment lines that IDE0055 reports (tabs vs. spaces at the same column)

  Area-IDEIDE-Formatter
  dotnet/roslyn#86097 · Filter by author bisforboman opened on Oct 17, 2026

• C# compiler should number the anonymous delegate types of lambdas with optional or params parameters the same in every build

  Area-CompilersConcept-DeterminismFeature - Default lambda parameters
  Bug

  dotnet/roslyn#86096 · Filter by author kkdev92 opened on Oct 17, 2026 · 18.13
  

• LSP file-based app discovery follows directory symlinks with no loop check (unbounded CPU and memory)

  Area-IDEFeature - Run File
  dotnet/roslyn#86090 · Filter by author epenabella opened on Oct 16, 2026
  2

  

• Syntax node actions for partial constructors are not called for the defining part

  Area-CompilersFeature - Partial Events and Constructors
  Bug

  dotnet/roslyn#86086 · Filter by author bjornhellander opened on Oct 16, 2026 · 18.13
  1

  

• Intermittent SourceGeneratorItemTests.AddingAGeneratedDocumentUpdatesListCorrectly Automatic failure

  Area-IDEFeature - Source GeneratorsKnown Build Error
  dotnet/roslyn#86082 · Filter by author jaredpar opened on Oct 15, 2026

• Exception in "Convert to regular constructor" on union type

  Area-IDEFeature - Unions
  dotnet/roslyn#86074 · Filter by author mm-jhn opened on Oct 15, 2026

• PlatformInformation.IsWindows/IsUnix checks can likely be replaced with RuntimeInformation.IsOSPlatform calls

  Area-CompilersConcept-Design DebtOngoing-Quality-Candidate
  dotnet/roslyn#86065 · Filter by author RikkiGibson opened on Oct 14, 2026 · Backlog

• Nullable analysis doesn't detect a fact that collection builder for an expanded params collection argument can produce a null value

  Area-CompilersFeature - Nullable Reference TypesFeature - ParamsCollectionsFeature - Unions
  Bug

  dotnet/roslyn#86064 · Filter by author AlekseyTs opened on Oct 14, 2026 · Backlog
  1

  

• Filtered generator runs can omit shared post-init sources and poison the compilation cache

  Area-CompilersFeature - Source Generators
  Bug

  dotnet/roslyn#86062 · Filter by author rmarinho opened on Oct 14, 2026 · 18.13
  

• Parameter post-conditions are unexpectedly applied through a user defined conversion used by the argument

  Area-CompilersFeature - Nullable Reference TypesFeature - Unions
  Bug

  dotnet/roslyn#86057 · Filter by author AlekseyTs opened on Oct 14, 2026 · 18.13
  5

  

• [Known Build Error] InvalidGotoLiftingBetweenGotoAndLabel4 fails with NullReferenceException

  Area-IDEKnown Build Error
  dotnet/roslyn#86052 · Filter by author mwiemer-microsoft opened on Oct 14, 2026
  3

• [Known Build Error] UseExistingServerConcurrently fails with Client disconnected RejectedBuildResponse

  Area-CompilersKnown Build Error
  dotnet/roslyn#86050 · Filter by author mwiemer-microsoft opened on Oct 14, 2026
  1

• EnC: adding an async lambda that awaits a dynamic call throws InvalidOperationException in DeltaMetadataWriter.GetFieldDefinitionHandle

  Area-InteractiveInteractive-EnC
  dotnet/roslyn#86045 · Filter by author kazo0 opened on Oct 14, 2026

• CodeGen: synthesized-closure methods for static local-functions are emitted with internal visibility

  Area-CompilersCode Gen QualityFeature - Local FunctionsOngoing-Quality-Candidate
  dotnet/roslyn#86043 · Filter by author bernd5 opened on Oct 13, 2026 · Backlog
  1