Issues

• Report unnecessary @using directives in Razor files from the command line

  dotnet/roslyn#86268 · Filter by author nmummau opened on Oct 30, 2026

• Razor formatting issue

  dotnet/roslyn#86262 · Filter by author MichelleGorrellUK opened on Oct 30, 2026
  1

• Incorrect implementation of IsEffectivelyReadOnly API with respect to reduced extension methods and generic construction

  Area-CompilersFeature - Ref Readonly Parameters
  Bug

  dotnet/roslyn#86257 · Filter by author AlekseyTs opened on Oct 30, 2026 · 18.14
  

• Missing diagnostics from a file containing only implementation part

  Area-CompilersFeature - Partial Events and ConstructorsFeature - Partial Properties
  Bug

  dotnet/roslyn#86250 · Filter by author jjonescz opened on Oct 29, 2026 · 18.14
  

• Razor doesn't parse escaped identifiers in using aliases

  Area-RazorArea-Razor-Compiler
  dotnet/roslyn#86246 · Filter by author davidwengier opened on Oct 29, 2026 · Backlog

• VB.NET: CInt(Math.Truncate(Double)) returns 22 instead of 21 inside an Async method

  Area-CompilersLanguage-VB
  Bug

  dotnet/roslyn#86239 · Filter by author bebeto-sencia opened on Oct 28, 2026 · 18.14
  

• Hot reload crashes with "An item with the same key has already been added. Key: 0" editing an async method with captures and an await in catch/finally

  Area-InteractiveInteractive-EnC
  dotnet/roslyn#86237 · Filter by author alexplumb opened on Oct 28, 2026
  1

• Language server: deleting many source files stalls every request that needs the project's compilation, about 1 s per deleted file

  Area-IDEBugLSP
  dotnet/roslyn#86236 · Filter by author Zaneris opened on Oct 28, 2026

• Assertion fails in ClassifyImplicitConversionFromExpression

  Area-CompilersFeature - Nullable Reference Types
  Bug

  dotnet/roslyn#86230 · Filter by author tmat opened on Oct 27, 2026 · 18.14
  1

  

• Unions: no nullable warning when a null conditional branch is converted to a union with non-nullable case types

  Area-CompilersFeature - Nullable Reference TypesFeature - Unions
  Bug

  dotnet/roslyn#86225 · Filter by author aradalvand opened on Oct 27, 2026 · 18.14
  2

  

• [Known Build Error] Pool leak in TestSuppression_CompilerSyntaxParseError_SuppressWarningCaughtDuringParsingStage

  Area-Analyzersblocking-clean-ciKnown Build Error
  Bug

  dotnet/roslyn#86221 · Filter by author build-insights opened on Oct 27, 2026 · 18.14
  

• Implicit Index: Length property can change class instance used as a receiver for indexer/Slice invocation

  Area-Compilers
  Bug

  dotnet/roslyn#86219 · Filter by author AlekseyTs opened on Oct 27, 2026 · 18.14
  

• Unsafe expression not supported for property

  Area-CompilersFeature - Unsafe Evolution
  Bug

  dotnet/roslyn#86211 · Filter by author hamarb123 opened on Oct 26, 2026 · 18.14
  2

  

• Compiler output cache drops warnings and changes MSBuild -warnaserror results

  Area-CompilersFeature - Caching Compiler
  Bug

  dotnet/roslyn#86198 · Filter by author sbomer opened on Oct 23, 2026 · 18.13
  

• Investigate eliminating unused synthesized struct this loads in async methods

  Area-CompilersFeature - Runtime Async
  Bug

  dotnet/roslyn#86195 · Filter by author 333fred opened on Oct 23, 2026 · .NET 12
  1

  

• Formatting depends on unrelated code: tied indent operations are ordered by an unstable sort

  Area-IDEIDE-Formatter
  dotnet/roslyn#86191 · Filter by author glen-84 opened on Oct 23, 2026
  1

• CS8629 and CS8604 are reported despite null checks after three left joins in query syntax

  Area-CompilersFeature - LINQ ConversionFeature - Nullable Reference Types
  Bug

  dotnet/roslyn#86188 · Filter by author fschmied opened on Oct 23, 2026 · Backlog
  2

  

• Enable persistent Roslyn indices for project-discovery workspaces

  Area-IDELSP
  dotnet/roslyn#86183 · Filter by author dibarbet opened on Oct 22, 2026
  

• ProjectData: importing SDK and tooling copies duplicates properties in .lscache files

  Area-IDE
  dotnet/roslyn#86182 · Filter by author emaf opened on Oct 22, 2026
  3

  

• Taking address of an element of a captured inline-array should be disallowed

  Area-CompilersFeature - Inline ArraysFeature - Local Functions
  Bug

  dotnet/roslyn#86179 · Filter by author jjonescz opened on Oct 22, 2026 · 18.13
  

• [aw] Detection Runs

  agentic-workflowsArea-Infrastructure
  dotnet/roslyn#86174 · Filter by author github-actions opened on Oct 22, 2026
  10

  

• IDE0058 code fix assigns to a lambda parameter named _ instead of discarding (silent behaviour change)

  Area-IDE
  dotnet/roslyn#86168 · Filter by author sy11a opened on Oct 21, 2026
  3

• An assert fires in RefSafetyAnalysis for an implicit indexer set access

  Area-CompilersFeature - Ref Fields
  Bug

  dotnet/roslyn#86166 · Filter by author AlekseyTs opened on Oct 21, 2026 · 18.13
  

• Definite-assignment error omitted for captured struct field through forward local-function call with many variable slots

  Area-CompilersFeature - Flow Analysis
  Bug

  dotnet/roslyn#86155 · Filter by author jjonescz opened on Oct 21, 2026 · 18.13
  

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

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