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

Improve compilation error when parametrizing non-partial active patterns Open

Area-Diagnostics Feature Request

dotnet/fsharp#12932 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Inference error shadows additional error Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#12958 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
dotnet fsi file package source reference not working with relative path #i Open

Impact-Medium Needs-design Needs-Repro

dotnet/fsharp#12969 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Tracking Issue for C# 11.0 Interop for F# 6.1/7.0 Open

Feature Request Plan

dotnet/fsharp#13007 · 23 comments · 8 reactions · 0 assignees · Indexed Sep 15, 2026
Improve Error Reporting: Make FS0039 easier to read at a glance. Open

Area-Diagnostics Feature Request

dotnet/fsharp#13012 · 11 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
Improve Error Reporting: help with ambiguity between subtraction and negation Open

Area-Diagnostics Feature Request

dotnet/fsharp#13014 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Type inference assigns name to method generic args that conflict with type generic args Open

Area-FCS Bug Impact-Low

dotnet/fsharp#13062 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add a CI leg for building and running tests on latest .NET (pre-release versions) Open

Engineering

dotnet/fsharp#13072 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Stack overflow typechecking large CEs on macOS Open

Area-Compiler-Checking Bug Impact-Medium

dotnet/fsharp#13084 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Static linking: Understanding FS2009 warnings Open

Area-Compiler-CodeGen Bug Impact-Medium

dotnet/fsharp#13108 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Debuggability - Watch window for some F# types do not support the Hexadecimal display option Open

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

dotnet/fsharp#13169 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Issue subclassing type with covariant return override of abstract base member Open

Area-Compiler-Checking Area-Compiler-Checking-Overloads Bug Impact-Medium Needs-RFC

dotnet/fsharp#13201 · 1 comment · 1 reaction · 1 assignee · Indexed Sep 15, 2026
Improve type formatting for C# nested types with generic parameters Open

Area-LangService-ToolTips Bug Impact-Medium

dotnet/fsharp#13202 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Add separate switch to build scripts for updating baselines Open

Area-Testing Contributor Pain Engineering

dotnet/fsharp#13204 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
List/Array/Seq.max/min/maxBy/minBy may return nan if the sequence starts with nan Open

Area-Library

dotnet/fsharp#13207 · 16 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Synchronize implementation files and signature files Open

Area-LangService-CodeFixes Feature Request

dotnet/fsharp#13215 · 2 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
Difference of compilation time between 13 000 "static member" and 13 000 "let binding" Open

Area-Compiler-CodeGen Feature Improvement Theme-Performance

dotnet/fsharp#13218 · 4 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Add FSharp.Build support for reference assemblies Open

Area-Build Area-Compiler-CodeGen Feature Improvement

dotnet/fsharp#13223 · 14 comments · 7 reactions · 0 assignees · Indexed Sep 15, 2026
[F#] Go to definition does not display attributes of the decompiled type Open

Area-LangService-Navigation Feature Improvement Impact-Low

dotnet/fsharp#13225 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Variable in scope is not visible after a bang!-operation in CE Open

Area-Debug Bug Impact-Medium

dotnet/fsharp#13291 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Missing XML docs in type parameter tooltips Open

Area-LangService-ToolTips Feature Improvement

dotnet/fsharp#13295 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
F# Work Streams Open

Plan

dotnet/fsharp#13296 · 0 comments · 20 reactions · 0 assignees · Indexed Sep 15, 2026
F# tooling rejects any use of <AndroidAppBundleMetaDataFile> Open

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

dotnet/fsharp#13336 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Xamarin Android templates are broken Open

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

dotnet/fsharp#13337 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
dotnet scripting / fsc compilation of .fsx scripts should package all the runtime dependencies along the compiled .exe Open

Area-FSI Feature Request

dotnet/fsharp#13341 · 16 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Request for debug team - always stepping in to a call Open

Area-Debug Feature Request

dotnet/fsharp#13342 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
When using EntryPoint attribute in fsx script top-level code is not executed Open

Area-FSI Bug Impact-Medium

dotnet/fsharp#13350 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
syntax coloring error for seq Open

Area-LangService-Colorization Feature Improvement

dotnet/fsharp#13388 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
`Tracking` F# AOT, Trimmability, ILLink Open

Area-AOT Feature Request Tracking

dotnet/fsharp#13398 · 12 comments · 16 reactions · 0 assignees · Indexed Sep 15, 2026
`Tracking` Compiler debuggability improvements Open

Contributor Pain Engineering Tracking

dotnet/fsharp#13424 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
FS-1093 op_Implicit 3395 warnings missing for constructors and potentially inconsistent Open

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

dotnet/fsharp#13437 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`Language` Ref fields support Open

Area-Compiler-ImportAndInterop Feature Request

dotnet/fsharp#13452 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Windows Forms in FSI works in Visual Studio but not calling dotnet fsi Open

Area-FSI Feature Improvement

dotnet/fsharp#13473 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add ast/tokenizer tests to FSharp.Compiler.ComponentTests Open

Area-Testing Engineering

dotnet/fsharp#13484 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Code navigation and syntax highlighting in MSVS breaks after switching Git branches Open

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

dotnet/fsharp#13496 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Nested reference type record values and nullable constraints Open

Area-Compiler-Service Feature Improvement

dotnet/fsharp#13498 · 9 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Support `-minimal` switch for ASP.NET templates for F# Open

Feature Improvement Tracking-External

dotnet/fsharp#13510 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Can't #load recursive namespaces into FSI Open

Area-FSI Bug Impact-Medium

dotnet/fsharp#13516 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Module and partially qualified namespace type shadowing interaction Open

Area-Compiler-Service Feature Request Needs-design

dotnet/fsharp#13535 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
SRTP resolution uses wrong witness, allows unreachable code reached Open

Area-Compiler-SRTP Bug Impact-Low

dotnet/fsharp#13537 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Reliable FCS benchmarks which run on every release Open

Theme-Performance

dotnet/fsharp#13606 · 6 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Full names for modules with backticks are incorrectly displayed Open

Area-LangService-ToolTips Feature Improvement

dotnet/fsharp#13613 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Full names for modules show logical names instead of display names Open

Area-LangService-ToolTips Feature Improvement

dotnet/fsharp#13614 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Chore: split monster-sized modules in the codebase Open

Contributor Pain Refactoring

dotnet/fsharp#13653 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Trait constraints that involve byref returns can never be satisfied by any method Open

Area-Compiler-SRTP Feature Request Needs-RFC

dotnet/fsharp#13674 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Show optional union field names in intellisense Open

Area-LangService-AutoComplete Feature Request good first issue help wanted

dotnet/fsharp#13682 · 1 comment · 2 reactions · 0 assignees · Indexed Sep 15, 2026
One of our negative test cases had an error that changed from attractive to spaghetti Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#13696 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
VS Create or open assembly resources gives "The system cannot find the file specified." Open

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

dotnet/fsharp#13762 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Fade-out of unused variables or parameters and dark theme Open

Area-LangService-Colorization Feature Improvement

dotnet/fsharp#13712 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Project system displays the C# warning levels mechanism for F# project Open

AI-thinks-windows-only Area-ProjectsAndBuild Area-VS Bug Impact-Medium Resolution-External Tracking-External

dotnet/fsharp#13714 · 9 comments · 2 reactions · 1 assignee · Indexed Sep 15, 2026

dotnet/fsharp

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