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

Extra code completion items in short lambda Open

Area-LangService-AutoComplete Bug Impact-Low

dotnet/fsharp#17162 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
The release notes on the public packages point to internal links Open

Bug Engineering Impact-Low

dotnet/fsharp#17172 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Consider deprecating desktop framework version of the F# compiler and FSI program Open

Engineering Feature Request

dotnet/fsharp#17195 · 6 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
dotnet fsi crashes with lines longer than terminal width Open

Area-FSI Bug Impact-Low

dotnet/fsharp#17215 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
An F# or C# shebang executable should use a cached binary on subsequent runs Open

Area-FSI Feature Request

dotnet/fsharp#17217 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
F# files moved with by dragging Open

Area-VS-Editor Feature Improvement

dotnet/fsharp#17218 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Enable F# Code Metrics and Analysis Open

Analyzers Area-VS Feature Request

dotnet/fsharp#17219 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve onhover tooltip for visual studio Open

Area-LangService-ToolTips Feature Improvement

dotnet/fsharp#17220 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support / fix replacing reference (Refactor -> Rename) of F# operator Open

Area-LangService-RenameSymbol Feature Improvement

dotnet/fsharp#17221 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
F# - Add Function Dependency Status to Functions/IntelliSense for F# (like C# has) Open

Area-VS Feature Request

dotnet/fsharp#17223 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Integral range optimizations in resumable code computation expressions Open

Area-Compiler-Optimization Feature Improvement

dotnet/fsharp#17253 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Cache and reuse full typecheck results between compiler/tooling runs Open

Theme-Performance

dotnet/fsharp#17260 · 0 comments · 2 reactions · 1 assignee · Indexed Sep 15, 2026
Intellisense commiting on characters including `'`, `;`, `"` Open

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

dotnet/fsharp#17280 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Split diagnostics into different diagnostic kinds for better user experience Open

Area-LSP Feature Improvement

dotnet/fsharp#17283 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Investigate: Special case Lock type in the lock function Open

Area-Library Feature Request

dotnet/fsharp#17287 · 7 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
`FSharpExpr` documentation references nonexistent module Open

Area-Documentation Impact-Low

dotnet/fsharp#17294 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Tracking issue - improve FSI debugging Open

Area-VS-FSI Feature Request

dotnet/fsharp#17306 · 1 comment · 16 reactions · 0 assignees · Indexed Sep 15, 2026
Visual Studio selects the highest version of the sdk installed on the machine when executing scripts in FSI Open

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

dotnet/fsharp#17307 · 6 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
We should disable the --multiemit[+/-] switch in fsi. Open

Area-FSI Triage-Investigate

dotnet/fsharp#17308 · 4 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
F# discriminated unions simple use raises AOT and trimming warnings on publish. Open

Area-AOT Feature Improvement

dotnet/fsharp#17324 · 3 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Fix or remove legacy VS tests Open

dotnet/fsharp#17330 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Minimize the number of desktop-only compiler service tests Open

Area-Infrastructure Impact-Low

dotnet/fsharp#17336 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Unify exceptions for out of bounds conditions in core functions Open

Area-Library Breaking-change Feature Request

dotnet/fsharp#17351 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
.NET Framework test runs are _super_ slow in CI Open

Contributor Pain

dotnet/fsharp#17353 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
F# using lazy keyword raises trimming warnings on publish. Open

Area-AOT Bug Feature Improvement

dotnet/fsharp#17355 · 1 comment · 1 reaction · 1 assignee · Indexed Sep 15, 2026
Cannot get the type of an object expression Open

Area-Tooling Bug Impact-Low

dotnet/fsharp#17366 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve the layering of F# to allow deprecation of ExtraTopLevelOperators Open

Area-Library Contributor Pain

dotnet/fsharp#17372 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Nullness feature request - enable nullness checking in .fsx scripts Open

Area-FSI Area-Nullness Feature Request

dotnet/fsharp#17401 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Nullness feature request- parser recovery for ` null | ..` Open

Area-Compiler-Syntax Area-Diagnostics Area-Nullness Feature Improvement

dotnet/fsharp#17408 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
[Visual studio] Nullness - GUI in property pages for a project to turn nullness checking on/off Open

Area-Nullness Area-VS Feature Request

dotnet/fsharp#17424 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Better diagnostics for mixing different nullness pattern matching ways Open

Area-Compiler-PatternMatching Area-Diagnostics Area-Nullness

dotnet/fsharp#17432 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Better diagnostics for nullness inference related errors Open

Area-Diagnostics Area-Nullness

dotnet/fsharp#17433 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
F# Intellisense is not initialized for net8.0-windows10.0.xxxxx Open

Area-VS Impact-High

dotnet/fsharp#17440 · 24 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Tooling suggestion: show function's capture list on hover Open

Area-LangService-ToolTips Area-LSP Feature Request

dotnet/fsharp#17444 · 0 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Refactor F# core into at least two assemblies. Open

Area-Library Feature Request

dotnet/fsharp#17496 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Nullness - Consider supporting Nullable shorthand for TreatWarningsAsErrors Open

Area-Nullness Feature Request good first issue help wanted Needs-Triage

dotnet/fsharp#17524 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support `textDocument/semanticTokens/full/delta` Open

Area-LSP Feature Request

dotnet/fsharp#17552 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`unit` elimination logic can lead to unutterable & unimplementable signatures Open

Area-Compiler-Checking Impact-Low

dotnet/fsharp#17611 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`open type T` treated as unused when unqualified extension member on `T` used Open

Area-LangService-UnusedOpens Bug Impact-Low

dotnet/fsharp#17629 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`open type` does not bring enum cases into scope in patterns Open

Area-Compiler-Checking Area-Compiler-Checking-NameResolution Breaking-change Bug help wanted Impact-Low

dotnet/fsharp#17630 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Investigate why `IsMethod` and `IsProperty` don't act as expected for generated methods/properties Open

Area-Compiler-CodeGen Bug Impact-Low

dotnet/fsharp#17641 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Ability to dump current interactive session to a file Open

Area-FSI Feature Request Needs-design

dotnet/fsharp#17670 · 3 comments · 6 reactions · 0 assignees · Indexed Sep 15, 2026
Revert workaround - https://github.com/dotnet/fsharp/pull/15982 Open

Area-VS-Editor Feature Improvement

dotnet/fsharp#17676 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`sprintf "%b" bool` causes AOT failure Open

Area-AOT Bug Impact-Low

dotnet/fsharp#17691 · 4 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Visual F# Go to definition from Source Link Open

Area-LangService-Navigation Feature Request

dotnet/fsharp#17695 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Nullness issue - Option.toObj infers input to be an option of a nullable type Open

Area-Nullness Bug help wanted Impact-Low

dotnet/fsharp#17727 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Nullness issue - Additional type hints needed in Computation Expression Open

Area-Nullness Feature Improvement

dotnet/fsharp#17776 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
CI: WindowsNoRealsig_testDesktop publish dump fails Open

Engineering

dotnet/fsharp#17777 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Introduce proper compiler-wise caches Open

Area-Compiler Continuous Improvement

dotnet/fsharp#17790 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Intellisense broken in VisualFSharp solution in VS Open

Area-VS Bug Impact-Medium

dotnet/fsharp#17794 · 9 comments · 1 reaction · 1 assignee · Indexed Sep 15, 2026

dotnet/fsharp

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