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

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1129 open issues indexed

Tooling support for binary breaking changes in components Open

Area-Compiler-Options Feature Request

dotnet/fsharp#12328 · 6 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: Use before definition within files and across whole project Open

Area-Diagnostics Feature Improvement Theme-Simple-F#

dotnet/fsharp#12341 · 6 comments · 6 reactions · 0 assignees · Indexed Sep 15, 2026
Parser vulnerable to Trojan Source attack Open

Area-Compiler-Syntax Feature Request Tracking-External

dotnet/fsharp#12352 · 19 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Complexity documentation is missing for several datastructures Open

Area-XmlDocs Feature Improvement help wanted

dotnet/fsharp#12354 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Rethink how names are given to compiler-generated closures Open

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

dotnet/fsharp#12366 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Use .NET Package Validation to check for binary compat against baseline Open

Engineering Impact-Low

dotnet/fsharp#12368 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Crash when accessing resx from Visual Studio F# Interactive in .NET Framework mode Open

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

dotnet/fsharp#12369 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Visual Studio closes if you add LangVersion>?</LangVersion> Open

AI-thinks-windows-only Area-Compiler-Options Bug Impact-Low

dotnet/fsharp#12372 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Recursive type with a legal Zero value fails to compile Open

Area-Compiler-Checking Area-Compiler-SRTP Bug Impact-Low

dotnet/fsharp#12379 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Mutually recursive non-function values with intermediate module definition not initialized incorrectly Open

Area-Compiler-CodeGen Bug Impact-Low Ready

dotnet/fsharp#12384 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Emit an additional `ExcludeFromCodeCoverageAttribute` for generated methods Open

Area-Debug Feature Improvement Theme-Simple-F#

dotnet/fsharp#12402 · 14 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
"unitVar0" showing in locals Open

Area-Debug Feature Improvement Impact-Medium

dotnet/fsharp#12408 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
In debugging, arguments are always shown instead of locals Open

AI-thinks-windows-only Area-Debug Bug Impact-Medium Theme-Simple-F#

dotnet/fsharp#12409 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Optimization inlining applied inconsistently with piping Open

Area-Compiler-CodeGen Area-Compiler-Optimization Feature Improvement Impact-Low Theme-Performance

dotnet/fsharp#12416 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`Bug` Quadratic(?) compiler perf for huge nested expressions Open

Area-Compiler-Optimization Feature Improvement Theme-Performance

dotnet/fsharp#12421 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Syntax highlighting fails inside for...to inside a computation expression Open

AI-thinks-windows-only Area-VS-Editor Bug Feature Improvement Needs-Confirmation

dotnet/fsharp#12449 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
F# and C# compiler produce some of Version info values differently Open

Area-Compiler-CodeGen Feature Improvement

dotnet/fsharp#12460 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Green color ascribed to end of a range, and to methods Open

Area-LangService-Colorization Bug Impact-Medium

dotnet/fsharp#12464 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Copy and update inside a folder function with an anonymous record prints a misleading error message Open

Area-Diagnostics Area-LangService-Diagnostics Feature Improvement

dotnet/fsharp#12489 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Parsing ambiguity with numeric literals and calling methods Open

Area-Diagnostics Area-LangService-Diagnostics Feature Improvement

dotnet/fsharp#12516 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: Namespace and Module collisions Open

Area-Diagnostics Bug Impact-Low Needs-Confirmation

dotnet/fsharp#12522 · 0 comments · 2 reactions · 1 assignee · Indexed Sep 15, 2026
Migrate to modern Visual Studio Interactive tool windows experience Open

Area-VS-FSI Feature Request

dotnet/fsharp#12536 · 9 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Implicit boxing produces extraneous closure Open

Area-Compiler-CodeGen Feature Improvement

dotnet/fsharp#12546 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Problem with type provider using dotnet fsi Open

Area-TypeProviders Bug Impact-Medium

dotnet/fsharp#12547 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Fixed keyword triggers compiler error in implicit entrypoint Open

Area-Compiler-Checking-Byref Feature Improvement

dotnet/fsharp#12548 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
MissingFieldException when assigning to a function pointer field Open

Area-Compiler-Checking Area-Compiler-Checking-Byref Bug Impact-Low

dotnet/fsharp#12551 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Diagnostics - types with names on tuples Open

Area-Diagnostics Area-LangService-Diagnostics Feature Improvement Theme-Simple-F#

dotnet/fsharp#12574 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: Fluent OO code fails if method argument application is not tied to the method name Open

Area-Diagnostics Area-LangService-Diagnostics Feature Improvement Theme-Simple-F#

dotnet/fsharp#12586 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Conditional interpolated printf formats give confusing error message Open

Area-Diagnostics Feature Improvement Impact-Low

dotnet/fsharp#12592 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Xml documentation code section does not respect multiline Open

Area-XmlDocs Feature Request

dotnet/fsharp#12601 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Incorrect error message with applicative Computation Expressions Open

Area-Diagnostics Bug Impact-Low

dotnet/fsharp#12607 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve Error Reporting: FSI: support for help/quitting/exiting Open

Area-FSI Feature Request

dotnet/fsharp#12616 · 5 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
dotnet fsi startup overhead surprisingly high Open

Area-FSI Feature Request Theme-Performance

dotnet/fsharp#12636 · 19 comments · 10 reactions · 1 assignee · Indexed Sep 15, 2026
XML Documentation generator is not aligned with its specification Open

Area-XmlDocs Bug Impact-Low

dotnet/fsharp#12650 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
False positive IDE0005 "Open declaration can be removed" when opening namespaces from some nuget packages Open

Area-LangService-UnusedOpens Bug Impact-Low

dotnet/fsharp#12667 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Race in GetProjectOptionsFromScript prevents getting referenced packages Open

Area-FSI Bug Impact-Medium

dotnet/fsharp#12683 · 7 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Dependency resolution for scripts in VS editor incorrectly affects execution behaviour of other "dotnet fsi" Open

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

dotnet/fsharp#12708 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Crash in VS when trying to wrap very large function body in 'async{...}' Open

Area-ComputationExpressions Feature Improvement Impact-Low

dotnet/fsharp#12752 · 1 comment · 2 reactions · 0 assignees · Indexed Sep 15, 2026
[Visual Studio] 2022 editor selection expansion works incorrectly Open

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

dotnet/fsharp#12760 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Values with special naming are not shown during debugging Open

AI-thinks-windows-only Area-Debug Bug Impact-Medium Theme-Simple-F#

dotnet/fsharp#12772 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Delegate returned from inline method is not itself inlined Open

Area-Compiler-SRTP Feature Improvement Impact-Low

dotnet/fsharp#12798 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`Tracking` Expression evaluator and debugger improvements Open

Area-Debug Tracking

dotnet/fsharp#12812 · 1 comment · 10 reactions · 0 assignees · Indexed Sep 15, 2026
Have a separate expression evaluator for F#, based on C# one, hidden under a preview feature flag in VS Open

Area-Debug Plan

dotnet/fsharp#12820 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support F# expressions in watch window. Open

Area-Debug Plan

dotnet/fsharp#12821 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
`Tracking` - Testing - move fsharpqa tests to new framework Open

Plan Tracking

dotnet/fsharp#12823 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
The first file when opening VS doesn't have proper syntax coloring Open

AI-thinks-windows-only Area-LangService-Colorization Bug Impact-Medium Regression

dotnet/fsharp#12861 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Disabling authenticated NuGet feed not enough to get around 11392 Open

Area-FSI Bug Impact-Low

dotnet/fsharp#12874 · 1 comment · 2 reactions · 0 assignees · Indexed Sep 15, 2026
paket dependency manager doesn't work out of the box in VS, but it does if compiles with VS Open

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

dotnet/fsharp#12895 · 11 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Try and refactor VS dependencies to reduce reliance on desktop net apis Open

Area-VS Feature Request

dotnet/fsharp#12916 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Type Inference Regression Open

Area-Compiler-Checking Bug Impact-Medium Regression

dotnet/fsharp#12929 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

dotnet/fsharp

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