Issues

• Native AOT: Implicit F# quotations throw PlatformNotSupportedException in RuntimeHelpers.InitializeArray

  BugNeeds-Triage
  Bug

  dotnet/fsharp#20942 · Filter by author bleis-tift opened on Nov 6, 2026 · Backlog

• allows ref struct type parameters accept 'T byref arguments: int byref seq compiles on net9.0+ and fails with TypeLoadException

  BugNeeds-TriageRegression
  Bug

  dotnet/fsharp#20936 · Filter by author xperiandri opened on Nov 5, 2026 · Backlog

• FS0193 on a call with an explicit type argument after an earlier call with the same argument types picked another overload (works in the .NET 10 SDK)

  BugNeeds-TriageRegression
  Bug

  dotnet/fsharp#20934 · Filter by author xperiandri opened on Nov 5, 2026 · Backlog

• [aw] F# MSBuild File Quality Review Agent failed

  agentic-workflows
  dotnet/fsharp#20927 · Filter by author github-actions opened on Nov 4, 2026

• Build-failure workflow regressions need owner triage

  dotnet/fsharp#20919 · Filter by author github-actions opened on Nov 3, 2026

• Release: inline function taking the address of a module-level let mutable emits a field reference to the wrong startup class when inlined into another assembly (TypeLoadException)

  Area-Compiler-CodeGenBug
  Bug

  dotnet/fsharp#20912 · Filter by author evgwpw opened on Nov 2, 2026 · Backlog

• [dnceng-bot] Branch fsharp/release/dev15.9.x can't be mirrored to Azdo fast forward branch

  Needs-Triage
  dotnet/fsharp#20911 · Filter by author dotnet-mirroring opened on Nov 2, 2026 · Backlog

• Debug build emits invalid IL (stack underflow) for a non tail match whose last rule binds a parameterized active pattern (regression in SDK 10.0.4xx)

  BugNeeds-TriageRegression
  Bug

  dotnet/fsharp#20910 · Filter by author adam-hebert opened on Nov 2, 2026 · Backlog

• Make LeafExpressionConverter copy immutable F# struct variables

  Needs-Triage
  dotnet/fsharp#20908 · Filter by author pcshrosbree opened on Nov 2, 2026 · Backlog

• Treat span-like types with a unit of measure as byref-like

  Needs-Triage
  dotnet/fsharp#20907 · Filter by author pcshrosbree opened on Nov 2, 2026 · Backlog

• [aw] Agentic State Machine — Diagram Generator failed

  agentic-workflows
  dotnet/fsharp#20893 · Filter by author github-actions opened on Nov 1, 2026

• Internal type in the global namespace of a referenced assembly shadows other referenced public members

  BugNeeds-Triage
  Bug

  dotnet/fsharp#20892 · Filter by author smoothdeveloper opened on Oct 31, 2026 · Backlog

• Transparent compiler only reports assembly-level attributes from last file

  BugNeeds-Triage
  Bug

  dotnet/fsharp#20890 · Filter by author Jand42 opened on Oct 31, 2026 · Backlog

• Checking a seq, list or array with thousands of yield statements is far slower than linear

  Needs-Triage
  dotnet/fsharp#20887 · Filter by author xperiandri opened on Oct 29, 2026 · Backlog

• Support struct tuple patterns in LeafExpressionConverter

  Needs-Triage
  dotnet/fsharp#20884 · Filter by author pcshrosbree opened on Oct 29, 2026 · Backlog

• SDK 10.0.402 emits invalid IL for async raise with record copy from static member

  BugNeeds-TriageRegression
  Bug

  dotnet/fsharp#20871 · Filter by author nbevans opened on Oct 27, 2026 · Backlog

• Runtime async: rethrow after a suspending handler or finally loses the stack trace

  BugNeeds-Triage
  Bug

  dotnet/fsharp#20869 · Filter by author majocha opened on Oct 27, 2026 · Backlog

• Exception raised during pretty printing

  BugNeeds-Triage
  Bug

  dotnet/fsharp#20860 · Filter by author ingted opened on Oct 24, 2026 · Backlog
  2

• Transparent Compiler: check a single file using only its dependency subgraph

  Needs-Triage
  dotnet/fsharp#20850 · Filter by author nojaf opened on Oct 23, 2026 · Backlog

• [aw] Agentic State Machine — Diagram Generator failed

  agentic-workflows
  dotnet/fsharp#20841 · Filter by author github-actions opened on Oct 22, 2026
  1

• Debug: FS2014 duplicate <f>__debug@N in method table for an inline call inside a resumable CE whose Run has caller-info parameters (regression in 11.0.100-rc.2)

  Area-Debug
  dotnet/fsharp#20836 · Filter by author jbtule opened on Oct 21, 2026 · Backlog
  2

• Compiling in a long-lived process emits types in a different order (FileIndex is process-wide)

  Feature Request
  dotnet/fsharp#20834 · Filter by author nojaf opened on Oct 21, 2026 · Backlog
  1

• FS0073 internal error: Undefined or unsolved type variable: 'C, intermittent in Release

  Bug
  Bug

  dotnet/fsharp#20812 · Filter by author xperiandri opened on Oct 19, 2026 · Backlog
  1

• Array.zip3 documentation describes the result as an array of pairs

  Needs-Triage
  dotnet/fsharp#20811 · Filter by author xperiandri opened on Oct 19, 2026 · Backlog

• Audit RequireCompilationThread and related not enforced phantom token/lock invariants wrt parallel compilation

  dotnet/fsharp#20804 · Filter by author majocha opened on Oct 18, 2026 · Backlog
  1