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

`Tracking` Documentation and user guides improvements Open

Tracking

dotnet/fsharp#14430 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Execute pipes line by line in fsi Open

Area-VS-FSI Feature Request

dotnet/fsharp#14432 · 5 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Confusing/incorrect type mismatch message in async CE Open

Area-Diagnostics Bug Impact-Low

dotnet/fsharp#14437 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Don't show parameter name hints for some built-in types Open

Area-LangService-Hints Feature Request good first issue

dotnet/fsharp#14448 · 2 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Extract Method refactoring Open

Area-VS-Editor Feature Request

dotnet/fsharp#14449 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
`use` binding for `IAsyncDisposable` not supported in F# interactive Open

AI-thinks-issue-fixed Area-SetupAndDelivery Bug Impact-Medium

dotnet/fsharp#14454 · 5 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Improve parser generation time Open

Area-Build Feature Request

dotnet/fsharp#14467 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Generate treesitter grammar Open

Area-Tooling Feature Request help wanted

dotnet/fsharp#14527 · 21 comments · 9 reactions · 0 assignees · Indexed Sep 15, 2026
Support IDE0049 in F# Open

Area-LangService-CodeFixes Feature Request

dotnet/fsharp#14541 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Editor Sticky Scroll not working properly with F# Open

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

dotnet/fsharp#14542 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add folders of F# files to F# Projects Open

Area-VS Feature Request

dotnet/fsharp#14544 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Structured plain text formatting on private values ignore width specifiers Open

Area-Compiler Bug good first issue help wanted Impact-Low

dotnet/fsharp#14557 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`internal error: no 'value__' field found for enumeration type` when `rec` module & `enum` constraint & type alias Open

Area-Compiler-Checking Area-Compiler-SRTP Bug Impact-Medium

dotnet/fsharp#14580 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Error list math: Build + Intellisense < Build Open

Area-LangService-Diagnostics Bug Impact-Medium

dotnet/fsharp#14585 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Debugger does not enable watch for mutable fields Open

Area-Debug Bug Impact-Medium

dotnet/fsharp#14623 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
VS "Show in Test Explorer" doesn't work for F# Open

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

dotnet/fsharp#14632 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
C# extensions show up in VS auto-complete as overloads on unrelated types Open

Area-LangService-AutoComplete Bug Impact-Medium

dotnet/fsharp#14636 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Compiler silently drops diagnostics with unknown range Open

Area-Diagnostics Bug Impact-Medium

dotnet/fsharp#14653 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add the `FSharp` and `Managed` ProjectCapabilties to project evaluation Open

Area-ProjectsAndBuild Feature Request

dotnet/fsharp#14658 · 2 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
Investigate why Roslyn doesn't call exported `IFSharpFindDefinitionService` Open

Area-VS

dotnet/fsharp#14675 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Visual F# Tools shows Option.toNullable is from another projects internal module Open

Bug Impact-Low Needs-Repro

dotnet/fsharp#14678 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
--codepage on coreclr F# compiler is incompatible with desktop compilers implementation Open

Area-Compiler-Options Bug Impact-Low

dotnet/fsharp#14693 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Misc. issues with output of interface stub generation Open

Area-Compiler-Service Bug Impact-Medium Regression

dotnet/fsharp#14698 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Signature file generation does not handle WhereTyparSubtypeOfType Open

Area-Compiler-CodeGen Bug help wanted Impact-Low

dotnet/fsharp#14706 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Existing signature files become unusable Open

Area-Compiler-CodeGen Bug help wanted Impact-Low

dotnet/fsharp#14707 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Signature file generation should use F# Core alias Open

Area-Compiler-CodeGen Bug Impact-Low

dotnet/fsharp#14712 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Incorrect warning for active pattern signature with generic parameters Open

Area-Diagnostics Bug Impact-Low

dotnet/fsharp#14736 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Cache provided types in the compiler Open

Area-TypeProviders Feature Request Theme-Performance

dotnet/fsharp#14754 · 2 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Package resolution doesn't correctly resolve references when guided by --targetprofile: Open

Bug Impact-Low

dotnet/fsharp#14781 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
In a separate project, a namespace sharing the same name as a module with ModuleSuffix is not visible Open

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

dotnet/fsharp#14798 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
A namespace sharing the same name as a module with ModuleSuffix *when the namespace is declared first* ~~declared in the same file~~ is not visible Open

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

dotnet/fsharp#14799 · 11 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve "Go to all" navigation in VS Open

Area-VS Feature Request

dotnet/fsharp#14826 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Code previews in diagnostics Open

Area-LangService-Diagnostics Feature Request

dotnet/fsharp#14832 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
FSharpClassificationService throws TaskCanceledException Open

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

dotnet/fsharp#14840 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Compiler service: file parsing should use caching. Open

Feature Request

dotnet/fsharp#14848 · 15 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Compiler service: parallel parsing. Open

Feature Request

dotnet/fsharp#14851 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Json parsing with struct and attributes changed from net6 to net7 Open

Bug Impact-High Regression Tracking-External

dotnet/fsharp#14858 · 13 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Compile a NativeLibrary with NativeAOT Open

Area-AOT Feature Request

dotnet/fsharp#14883 · 4 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Improve type parameter display in tooltips Open

Area-LangService-ToolTips Area-XmlDocs Bug Impact-Medium

dotnet/fsharp#14887 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
FCS: Tests for partial type checking Open

Area-Testing Contributor Pain

dotnet/fsharp#14921 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
F# "//#region" not working Open

Area-VS-Editor Feature Request

dotnet/fsharp#14925 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Can build solution with dotnet build but not using VS Open

Area-Compiler-Syntax Bug Impact-Medium Regression

dotnet/fsharp#14975 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Placeholder: Using ASP.NET core minimal APIs from F# inflicts physical pain Open

dotnet/fsharp#14992 · 3 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Find All References in multiple language solution Open

Area-VS Feature Request

dotnet/fsharp#15006 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Show return type hints for lambdas Open

Area-LangService-Hints Feature Request

dotnet/fsharp#15015 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
VS: code related to updating statusbar is defunct Open

Area-VS

dotnet/fsharp#15040 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
VS sometimes runs more than one incremental builder for the same project Open

Area-Compiler-Service Bug Impact-Medium Needs-Repro

dotnet/fsharp#15060 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Performance telemetry Open

Theme-Telemetry

dotnet/fsharp#15061 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Too many `&` and `|` patterns cause Visual Studio/Ionide to use up all available memory Open

Area-Compiler-Checking Area-Compiler-PatternMatching Bug Impact-Medium Regression Theme-Performance

dotnet/fsharp#15086 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Should we generate DebuggerProxies in release code? Open

Area-Compiler-CodeGen Feature Improvement

dotnet/fsharp#15092 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026

dotnet/fsharp

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