Issues

• A wrong type is reported in a type mismatch error

  Buggood first issuehelp wanted
  Bug

  dotnet/fsharp#18849 · Filter by author auduchinok opened on Aug 14, 2025 · Backlog
  7

• assert keyword: have compiler emit call to Debug.Assert overload with CallerArgumentExpression where possible

  Area-Compiler-CheckingFeature Requestgood first issuehelp wanted
  dotnet/fsharp#18489 · Filter by author brianrourkeboll opened on Apr 21, 2025 · Backlog
  8

• CI should check the dev container setup

  Area-ToolingContinuous Improvementhelp wanted
  dotnet/fsharp#18321 · Filter by author Martin521 opened on Feb 17, 2025 · Backlog
  4

• Optimizing non-tail recursions for sequences

  Area-Compiler-OptimizationArea-Compiler-StateMachinesFeature Requesthelp wanted
  Feature

  dotnet/fsharp#18213 · Filter by author AlexRadch opened on Jan 8, 2025 · Backlog
  3

• byref parameters starting with some non-ASCII identifiers cannot be set.

  Bughelp wantedImpact-Low
  Bug

  dotnet/fsharp#18164 · Filter by author ijklam opened on Dec 19, 2024 · Backlog
  13

• VS2022 F# Interactive output pane interspersing empty lines at random on large text output

  AI-thinks-windows-onlyArea-VS-FSIBughelp wantedImpact-Low
  Bug

  dotnet/fsharp#18064 · Filter by author smoothdeveloper opened on Nov 26, 2024 · Backlog
  1

• [<System.ParamArray>] parameter in member function causes type check error.

  Area-Compiler-CheckingFeature Improvementhelp wantedTriage-Investigate
  Feature

  dotnet/fsharp#17957 · Filter by author i-shm opened on Nov 5, 2024 · Backlog
  3

• Mixing named arguments + callback style and getter should not compile

  Bughelp wantedImpact-Low
  Bug

  dotnet/fsharp#17935 · Filter by author MangelMaxime opened on Oct 29, 2024 · Backlog
  2

• Nullness issue - Option.toObj infers input to be an option of a nullable type

  Area-NullnessBughelp wantedImpact-Low
  Bug

  dotnet/fsharp#17727 · Filter by author kerams opened on Sep 14, 2024 · Backlog
  3

• open type does not bring enum cases into scope in patterns

  Area-Compiler-CheckingArea-Compiler-Checking-NameResolutionBreaking-changeBughelp wantedImpact-Low
  Bug

  dotnet/fsharp#17630 · Filter by author brianrourkeboll opened on Aug 28, 2024 · Backlog
  9

• Nullness - Consider supporting Nullable shorthand for TreatWarningsAsErrors

  Area-NullnessFeature Requestgood first issuehelp wantedNeeds-Triage
  Feature

  dotnet/fsharp#17524 · Filter by author BoundedChenn31 opened on Aug 12, 2024 · Backlog
  6

• tooltip for enums show [<Struct>] type instead of enum

  Area-LangService-ToolTipsFeature Improvementhelp wanted
  dotnet/fsharp#16923 · Filter by author smoothdeveloper opened on Mar 21, 2024 · Backlog
  1

• Support F# Kernel (dotnet-interactive) on Wasm

  Area-FSIFeature Requesthelp wanted
  Feature

  dotnet/fsharp#16881 · Filter by author pawel-stadnicki-gertrud opened on Mar 15, 2024 · Backlog
  20

• VS: allowStaleResults is hardcoded false

  Area-VShelp wanted
  dotnet/fsharp#16487 · Filter by author majocha opened on Jan 3, 2024 · Backlog
  1

• FS3559 triggers on query expressions

  Area-DiagnosticsBughelp wantedImpact-Medium
  Bug

  dotnet/fsharp#16455 · Filter by author cmeeren opened on Dec 20, 2023 · Backlog

• Don't warn FS3559 when obj is inferred if the obj is expected there

  Area-DiagnosticsBughelp wantedImpact-Low
  Bug

  dotnet/fsharp#16454 · Filter by author cmeeren opened on Dec 20, 2023 · Backlog
  1

• AddOpen opens the wrong namespace for IEnumerator

  Area-LangService-CodeFixesBuggood first issuehelp wantedImpact-Medium
  Bug

  dotnet/fsharp#16155 · Filter by author kerams opened on Oct 22, 2023 · Backlog
  1

• Existing signature files become unusable

  Area-Compiler-CodeGenBughelp wantedImpact-Low
  Bug

  dotnet/fsharp#14707 · Filter by author nojaf opened on Feb 6, 2023 · Backlog

• Signature file generation does not handle WhereTyparSubtypeOfType

  Area-Compiler-CodeGenBughelp wantedImpact-Low
  Bug

  dotnet/fsharp#14706 · Filter by author nojaf opened on Feb 6, 2023 · Backlog

• Structured plain text formatting on private values ignore width specifiers

  Area-CompilerBuggood first issuehelp wantedImpact-Low
  Bug

  dotnet/fsharp#14557 · Filter by author calebho opened on Jan 8, 2023 · Backlog
  1

• Generate treesitter grammar

  Area-ToolingFeature Requesthelp wanted
  dotnet/fsharp#14527 · Filter by author vzarytovskii opened on Jan 2, 2023 · Backlog
  21

• Seq.except xml doc description / tooltip info can be improved

  Area-XmlDocshelp wanted
  dotnet/fsharp#14251 · Filter by author abelbraaksma opened on Nov 7, 2022 · Backlog
  1

• Add extra tests for the compiler options parser

  Area-TestingFeature Requestgood first issuehelp wanted
  dotnet/fsharp#13878 · Filter by author psfinaki opened on Sep 12, 2022 · Backlog

• Show optional union field names in intellisense

  Area-LangService-AutoCompleteFeature Requestgood first issuehelp wanted
  dotnet/fsharp#13682 · Filter by author jimfoye opened on Aug 12, 2022 · Backlog
  1

• Complexity documentation is missing for several datastructures

  Area-XmlDocsFeature Improvementhelp wanted
  dotnet/fsharp#12354 · Filter by author vavans opened on Nov 7, 2021 · Backlog
  1