dotnet/fsharp

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The F# compiler, F# core library, F# language service, and F# tooling integration for Visual Studio

Stars: 4.3k
Forks: 876
Open beginner issues: 0
Indexed issues: 1.1k
Avg merge: 4d 22h
Merged PRs (30d): 144

Dominant language: F#
License: MIT
Last GitHub push: Sep 14, 2026
Latest indexed: Sep 15, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: help wanted good first issue

Open All

1129 open issues indexed

MSB4011 warning when using net6.0-macos (inside Visual Studio only) Open

AI-thinks-windows-only Area-VS Bug Impact-Medium

dotnet/fsharp#13724 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Overload resolution does not eliminate incompatible Nullable candidates Open

Area-Compiler-Checking Area-Compiler-Checking-Overloads Feature Request Needs-RFC

dotnet/fsharp#13731 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
F# strange difference in resolving class method calls Open

Area-Compiler-Checking Area-Compiler-Checking-Overloads Bug Impact-Low

dotnet/fsharp#13769 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
FSharpMemberOrFunctionOrValue doesn't include attributes for params in CurriedParameterGroups Open

Area-FCS Feature Improvement Impact-Medium

dotnet/fsharp#13786 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Can we get feedback when compiling, about what FSC version is being used? Open

Area-FCS Feature Request

dotnet/fsharp#13816 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add extra tests for the compiler options parser Open

Area-Testing Feature Request good first issue help wanted

dotnet/fsharp#13878 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Prohibit XML documentation with params for the primary constructor above the type Open

Area-XmlDocs Feature Request

dotnet/fsharp#13922 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Compiler error Constructor on type 'FSharp.DependencyManager.Nuget.FSharpDependencyManager' not found. Open

Area-DependencyManager Bug

dotnet/fsharp#13923 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
VS2022 Colouring is broken when resetting "Fonts and Colors" to default values Open

Area-VS-Editor Impact-Medium Regression

dotnet/fsharp#13927 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
F# editor does not consider begin..end blocks when expanding selection Open

Area-VS-Editor Feature Request

dotnet/fsharp#13947 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Move to MetadataAsSource as oppose of creating new project context Open

Area-VS-Editor Feature Improvement

dotnet/fsharp#13951 · 2 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Duplicate member signature error is not reported in signature files Open

Area-Compiler-Checking Bug Impact-Medium

dotnet/fsharp#13981 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Calling op_Addition on primitive types doesn't work Open

Bug Impact-Low Resolution-By Design

dotnet/fsharp#14013 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`Tracking` Visual Studio and tooling fixes & improvements Open

Area-VS Tracking

dotnet/fsharp#14014 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`Tracking` C#<->F# interop Open

Area-Compiler-ImportAndInterop Tracking

dotnet/fsharp#14015 · 0 comments · 6 reactions · 0 assignees · Indexed Sep 15, 2026
`Tracking` Infra, engineering & testing improvements Open

Engineering Tracking

dotnet/fsharp#14016 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`Tracking` Performance infrastructure, improvements & optimizations Open

Theme-Performance Tracking

dotnet/fsharp#14017 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Wrong "Parameter name doesn't match signature" warning Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#14018 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
`Tracking` CodeLens Open

Area-LangService-CodeLens Area-VS

dotnet/fsharp#14036 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Expr.TryGetReflectedDefinition on Blazor WebAssembly Open

Bug Impact-Low Needs-Repro

dotnet/fsharp#14054 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Adding an FSI Signature File removes generic type resolution in tooltips Open

Area-LangService-ToolTips Bug Impact-Medium Theme-Simple-F#

dotnet/fsharp#14124 · 4 comments · 1 reaction · 1 assignee · Indexed Sep 15, 2026
for 0 in ... do gives warning "Incomplete pattern matches" (FS0025) Open

Area-Diagnostics Feature Improvement Theme-Simple-F#

dotnet/fsharp#14140 · 11 comments · 5 reactions · 0 assignees · Indexed Sep 15, 2026
`Tracking`: F# Hints Open

Area-LangService-Hints

dotnet/fsharp#14157 · 11 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
In FSI, an invalid string literal can break further parsing of string in that interactive session Open

Area-FSI Bug Impact-Medium

dotnet/fsharp#14160 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
FS3388 (implicit conversion warning) rarely gets triggered when it should, using `--warnon: 3388` Open

Area-Diagnostics Feature Request

dotnet/fsharp#14163 · 5 comments · 5 reactions · 1 assignee · Indexed Sep 15, 2026
Improve .fsi tooling experience to keep signatures and implementation in sync Open

Area-Compiler-SigFileGen Feature Improvement Feature Request

dotnet/fsharp#14170 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Double click on the identifier does not select whole identifier Open

AI-thinks-windows-only Area-VS-Editor Bug Impact-Low

dotnet/fsharp#14192 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
`Tracking` F# language feature requests and improvements Open

Feature Improvement Feature Request Tracking

dotnet/fsharp#14193 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Crash when using code quotations in tests Open

Bug Impact-Low

dotnet/fsharp#14225 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`Spike`: Splitting F# corelib for runtime and compile-time parts Open

Area-Library

dotnet/fsharp#14229 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Annotating .fs file under TSVC very frequently causes hang + restart of VS Open

AI-thinks-windows-only Area-VS-Editor Bug Impact-Low Needs-Repro

dotnet/fsharp#14236 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Seq.except xml doc description / tooltip info can be improved Open

Area-XmlDocs help wanted

dotnet/fsharp#14251 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Update VS-related nuget feeds Open

Engineering

dotnet/fsharp#14265 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add tooltips for the hints Open

Area-LangService-Hints good first issue

dotnet/fsharp#14268 · 4 comments · 2 reactions · 1 assignee · Indexed Sep 15, 2026
FSharp.Compiler.Service uses latest TargetFramework when compiling scripts rather than environment. Open

Bug Impact-Medium

dotnet/fsharp#14289 · 11 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Tooling :: Interop story for .NET libraries using C# source generators for high performance Open

Area-Compiler-ImportAndInterop Area-ProjectsAndBuild Feature Request

dotnet/fsharp#14300 · 12 comments · 23 reactions · 0 assignees · Indexed Sep 15, 2026
TaskCanceledException is thrown in Microsoft.CodeAnalysis.ExternalAccess.FSharp.Internal.Classification.FSharpClassification Open

AI-thinks-windows-only Area-VS-Editor Bug

dotnet/fsharp#14309 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Issue with consuming DLLs built with .NET7 from .NET6 Open

Informational

dotnet/fsharp#14313 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Overload resolution does not prefer method that would need less conversions Open

Area-Compiler-Checking Area-Compiler-Checking-Overloads Feature Improvement Needs-RFC

dotnet/fsharp#14318 · 2 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Generic constraint `comparison` is required despite type being restricted to `INumber` (generic math .NET 7) Open

Area-Compiler-SRTP Needs-RFC Resolution-By Design

dotnet/fsharp#14338 · 3 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Hello World doesn't work with reflection disabled in NAOT Open

Area-AOT Feature Improvement

dotnet/fsharp#14355 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Module `do` is often not evaluated, static initializers Open

Area-Compiler-CodeGen Feature Improvement Needs-RFC Theme-Simple-F#

dotnet/fsharp#14362 · 10 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Make Type Hints less intrusive Open

Area-LangService-Hints Feature Request good first issue

dotnet/fsharp#14382 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Consider showing inline hints to the right side of the cursor Open

Area-LangService-Hints Feature Improvement

dotnet/fsharp#14385 · 5 comments · 1 reaction · 1 assignee · Indexed Sep 15, 2026
OpenApi Swashbuckle support for Aspnetcore APIs in F# Open

Area-Compiler-CodeGen Feature Request Needs-RFC

dotnet/fsharp#14392 · 3 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Syntax error with string interpolation - Unexpected identifier in binding Open

Area-Compiler-Syntax Bug Impact-Low

dotnet/fsharp#14394 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Type hints show redundant info in SRTP Open

Area-LangService-Hints Bug good first issue

dotnet/fsharp#14400 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Type inference on task state machine could be improved Open

Area-Compiler-StateMachines Feature Request

dotnet/fsharp#14415 · 0 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Reenable: Private function, with signature file Open

Bug Impact-Low

dotnet/fsharp#14419 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Compilation gets much slower when using many computation expressions Open

Area-ComputationExpressions Theme-Performance

dotnet/fsharp#14429 · 23 comments · 5 reactions · 0 assignees · Indexed Sep 15, 2026

dotnet/fsharp

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