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 11h
Merged PRs (30d): 131

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

1143 open issues indexed

Instantiating a generative type provider twice results in invalid IL Open

Area-TypeProviders Bug Impact-Low

dotnet/fsharp#37 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Generic Record Types have different Equality semantics to concrete types Open

Area-Compiler-Optimization Bug Impact-Low

dotnet/fsharp#527 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Incorrect result of Equals involving NaN in structural type nested in generic structural type Open

Area-Library Feature Improvement

dotnet/fsharp#556 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Emit a warning when referencing console applications exe's without a main Open

Area-Diagnostics Bug Impact-Medium Theme-Simple-F#

dotnet/fsharp#602 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Better errors message when exception raised in ProvidedTypeDefinition.AddMembersDelayed Open

Area-TypeProviders Bug Impact-Low

dotnet/fsharp#710 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Unions with 4 or more cases silently fail to utilize UseNullAsTrueValue. Open

Area-Compiler-Checking Bug Impact-Low

dotnet/fsharp#711 · 13 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Type annotation adjacency warning doesn't consider operator names Open

Area-Compiler-Syntax Bug Impact-Low

dotnet/fsharp#774 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Illegal prefix operators sometimes compile fine, but give confusing errors when applied Open

Area-Compiler-Syntax Bug Impact-Low

dotnet/fsharp#792 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Send-to-interactive of incomplete string leaves FSI waiting for more input Open

Area-VS-FSI Feature Improvement Theme-Simple-F#

dotnet/fsharp#830 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
No message reported when a ProvidedType has an ObsoleteAttribute Open

Area-TypeProviders Bug Impact-Low

dotnet/fsharp#897 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Misleading error message when using [<CustomEquality>] or [<CustomComparison>] with a non-structural type Open

Feature Improvement

dotnet/fsharp#960 · 4 comments · 14 reactions · 0 assignees · Indexed Sep 15, 2026
Recursive sequence expression containing recursive definition doesn't run in finite space Open

Area-Compiler-StateMachines Feature Improvement Impact-Low

dotnet/fsharp#996 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Different indentation level changes behaviour of the code Open

dotnet/fsharp#1019 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
`Tracking` Error reporting improvements Open

Analyzers Area-Diagnostics Feature Improvement Theme-Simple-F# Tracking

dotnet/fsharp#1103 · 29 comments · 37 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: Function accidentally partially applied Open

Feature Improvement Theme-Simple-F#

dotnet/fsharp#1107 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Non-public properties in generated assembly break code completion Open

Area-LangService-AutoComplete Bug Impact-Low

dotnet/fsharp#1111 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: add an url with more info for each warning/error Open

Feature Improvement Theme-Simple-F#

dotnet/fsharp#1136 · 8 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: suggest inlining when compiler constrains types to be less generic Open

Feature Improvement Theme-Simple-F#

dotnet/fsharp#1160 · 6 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Some warnings may be discarded using #load with forward slash path separators Open

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

dotnet/fsharp#1240 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Running F# scripts in unix without proper file extensions results in strange behaviour Open

Area-FSI Bug help wanted Impact-Low

dotnet/fsharp#1241 · 15 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
The compiler infers the wrong type. Open

Area-Compiler-SRTP Bug Impact-Low

dotnet/fsharp#1287 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: report visibility issue between two assemblies Open

Feature Improvement Theme-Simple-F#

dotnet/fsharp#1348 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Strange error messages - Units-of-measure Open

Feature Improvement

dotnet/fsharp#1361 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: importing modules from an assembly compiled as Exe but without explicit EntryPoint should raise a warning Open

Feature Improvement Theme-Simple-F#

dotnet/fsharp#1371 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: Better heuristics for identifying the code line with a type error Open

Feature Improvement

dotnet/fsharp#1384 · 2 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: Warn when pipe operators are incorrectly indented Open

Feature Improvement Theme-Simple-F#

dotnet/fsharp#1442 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Suggestion: support F# Snippets Open

Area-LangService-AutoComplete Feature Request Theme-Simple-F#

dotnet/fsharp#1498 · 14 comments · 6 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: Match expressions with DUs missing parentheses around their tupled arguments Open

Feature Improvement Theme-Simple-F#

dotnet/fsharp#1511 · 2 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Incorrect indentation mixed with #if gives surprising results Open

Area-Compiler-Syntax Bug Impact-Low

dotnet/fsharp#1564 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve diagnostics for inlining in class methods - FS1114, FS1113, FS1116, FS1118 Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#1565 · 28 comments · 3 reactions · 1 assignee · Indexed Sep 15, 2026
Fail to resolve to non generic overload. Open

Feature Improvement Needs-RFC Resolution-By Design

dotnet/fsharp#1647 · 10 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: message when defining record with open brace on separate line Open

Feature Improvement Theme-Simple-F#

dotnet/fsharp#1826 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Hash function returns different result in F# and C# Open

Area-Compiler-Optimization Feature Request

dotnet/fsharp#2103 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Blockstructure lines are a bit weird Open

AI-thinks-windows-only Area-LangService-BlockStructure Bug Impact-Low

dotnet/fsharp#2115 · 12 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add intellisense to VS FSI Open

Area-VS-FSI Feature Request

dotnet/fsharp#2161 · 22 comments · 7 reactions · 0 assignees · Indexed Sep 15, 2026
VS FSI should provide syntax highlighting Open

Area-VS-FSI Feature Request

dotnet/fsharp#2180 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add "remove unneeded 'new' keyword" analyzer and code fix Open

Area-LangService-CodeFixes Feature Request

dotnet/fsharp#2266 · 0 comments · 5 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: property syntax can't be remembered Open

Area-Diagnostics Feature Improvement Theme-Simple-F#

dotnet/fsharp#2277 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error reporting: Accessing protected members within async blocks. Open

Feature Improvement Theme-Simple-F#

dotnet/fsharp#2307 · 10 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Warning or error should be raised when alternative constructor calls itself Open

Area-Diagnostics Feature Improvement Theme-Simple-F#

dotnet/fsharp#2321 · 9 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
FSharp.Core XML help is not localized Open

Area-XmlDocs Feature Request

dotnet/fsharp#2360 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Blockstructure Issues Open

AI-thinks-windows-only Area-LangService-BlockStructure Bug Impact-Medium

dotnet/fsharp#2431 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Support F# expression in debugger eval Open

Area-Debug Feature Request

dotnet/fsharp#2544 · 8 comments · 14 reactions · 1 assignee · Indexed Sep 15, 2026
Intellisense Quick Info blocks half of my screen when I hover over some keywords Open

AI-thinks-windows-only Area-LangService-ToolTips Bug Impact-Medium

dotnet/fsharp#2628 · 16 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Show argument names in tooltips for functions defined inside classes Open

AI-thinks-windows-only Area-LangService-ToolTips Bug Impact-Low

dotnet/fsharp#2650 · 1 comment · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Code inside <c></c> is not highlighted in XML Doc Open

Area-LangService-Colorization Feature Request

dotnet/fsharp#2670 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
VS: Make Fantomas auto-discoverable when user invokes F# format document/selection Open

Area-VS Feature Request good first issue help wanted

dotnet/fsharp#2693 · 20 comments · 4 reactions · 1 assignee · Indexed Sep 15, 2026
Generate References for FSI Open

Area-VS-FSI Feature Request

dotnet/fsharp#2705 · 9 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Improve Error Reporting: "inner" expressions inside computations expressions Open

Area-Diagnostics Feature Improvement Theme-Simple-F#

dotnet/fsharp#2739 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Nested Linq expression trees result in quotation related calls Open

Area-Quotations Bug Impact-Medium

dotnet/fsharp#2758 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026

dotnet/fsharp

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