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

1140 open issues indexed

Value inside parenthesized lambda is generalized when it shouldn't be Open

Area-LangService-AutoComplete Bug Impact-Low

dotnet/fsharp#4144 · 5 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Use single xmlDoc for sig and impl files in tooltips Open

Area-LangService-ToolTips Feature Improvement

dotnet/fsharp#4146 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Type inference breaks when class is not sealed Open

Area-Compiler-SRTP Bug Impact-Medium

dotnet/fsharp#4171 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Wrong indentation in list comprehension leads to unhelpful error message Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#4232 · 0 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Improve error message when yield! was used but yield is needed and vice versa Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#4233 · 4 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Indentation rules should be made clearer in list comprehsions Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#4234 · 8 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Improve error message in pattern matching when we forget to match the payload Open

Area-Diagnostics Feature Improvement Theme-Simple-F#

dotnet/fsharp#4246 · 2 comments · 7 reactions · 1 assignee · Indexed Sep 15, 2026
Add support for Autos window Open

Area-Debug Feature Request

dotnet/fsharp#4271 · 3 comments · 5 reactions · 0 assignees · Indexed Sep 15, 2026
Emit a warning when x.ToString(), x.GetHashCode or x.Equals(y) are used directly on option-typed values Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#4345 · 20 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Make FS0078 a warning instead of an error. Open

Area-DependencyManager Area-FSI Feature Improvement

dotnet/fsharp#4362 · 8 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Unhelpful error when using wrongly indented yield! in list comprehension Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#4400 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
C# project referencing F# project, intellisense doesn't detect changes until manual build Open

Area-LangService-Diagnostics Feature Improvement

dotnet/fsharp#4415 · 8 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Error FS0001 instead of FS0249 for overlapped names Open

Area-Diagnostics Bug Impact-Low

dotnet/fsharp#4601 · 1 comment · 1 reaction · 0 assignees · Indexed Sep 15, 2026
FS0748 error "This construct may only be used in computation expresions" reported for 'return' when it is not true Open

Feature Improvement

dotnet/fsharp#4653 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Access modifier `type private X with ...` type extensions is ignored Open

Area-Compiler-Checking Area-Compiler-Checking-Accessibility Bug Impact-Medium

dotnet/fsharp#4654 · 6 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Symbols API: different constructor overloads considered equal Open

Area-LangService-API Feature Improvement

dotnet/fsharp#4663 · 7 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Exceptions aren't handled in UnusedOpens Open

Area-LangService-UnusedOpens Bug Impact-Medium

dotnet/fsharp#4664 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Compiling causes OutOfMemoryException and IDE unresponsive/crash when pattern matching against record with many nested DU fields Open

Area-Compiler-PatternMatching Feature Improvement Theme-Performance

dotnet/fsharp#4691 · 17 comments · 3 reactions · 0 assignees · Indexed Sep 15, 2026
Multiple Constructors require different syntax Open

Area-Compiler-Syntax Feature Improvement

dotnet/fsharp#4704 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Perf: ITypeProvider.ApplyStaticArguments is called multiple times Open

Area-TypeProviders Bug Impact-Medium

dotnet/fsharp#4706 · 3 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Perf: The first time that a ITypeProvider.Invalidate event is fired, the existing type providers instances are not disposed Open

Feature Improvement

dotnet/fsharp#4707 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Improve error message when let! _ is last statement in computation expressions Open

Area-Diagnostics Feature Improvement Theme-Simple-F#

dotnet/fsharp#4783 · 7 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Custom operations from outer computation expression are in the completion list inside nested computation expression Open

Area-LangService-AutoComplete Feature Improvement

dotnet/fsharp#4865 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Program that should not compile, using statically resolved type parameters, gets runtime exception instead Open

Area-Compiler-SRTP Bug Impact-Medium

dotnet/fsharp#4924 · 21 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Make Type Provider troubleshooting easier with better error reporting Open

Area-TypeProviders Feature Improvement

dotnet/fsharp#4956 · 5 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
autocomplete after dot broken under certain condition Open

Area-LangService-AutoComplete Bug Impact-Low

dotnet/fsharp#4965 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
confusing error message when method has overloads and is called with generic type argument Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#4969 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
"Navigation bar" setting does not survive VS restart Open

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

dotnet/fsharp#5016 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Make typedefof more efficient Open

Area-Compiler-Optimization Feature Improvement

dotnet/fsharp#5019 · 25 comments · 5 reactions · 0 assignees · Indexed Sep 15, 2026
Using '&&' can lead to hard-to-understand errors Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#5061 · 1 comment · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Place cursor in indented location with automatic brace completion turned on Open

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

dotnet/fsharp#5106 · 3 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Wrong completion after dot on a parameter without type hint in unfinished lambda Open

Area-LangService-AutoComplete Bug Impact-Low

dotnet/fsharp#5120 · 2 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Error message "This function takes too many arguments..." can be improved Open

Area-Diagnostics Bug Impact-Low

dotnet/fsharp#5132 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Testing: add case for semi-poly-variadic functions which does not compile anymore in VS 2017 Open

Area-Compiler-SRTP Impact-Low Resolution-By Design

dotnet/fsharp#5214 · 4 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Reword or better explain unique names on Struct DUs Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#5236 · 3 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Improved error message: `use y = fixed x` does not compile inside computation expressions Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#5253 · 3 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Better diagnostics when using "as alias" in binding without wrapping expression in parens Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#5259 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
sbyte array comparison doesn't work correctly with negative values Open

Area-Library Bug Impact-Low

dotnet/fsharp#5263 · 13 comments · 1 reaction · 0 assignees · Indexed Sep 15, 2026
Poor codegen for 'use' binding on struct enumerator Open

Area-Compiler-Optimization Feature Improvement

dotnet/fsharp#5291 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add default resource to F# Standard 2.0 fails with : Cannot find the requested resource: '300'. Open

Feature Improvement

dotnet/fsharp#5298 · 2 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Add tooltips for literals Open

Area-LangService-ToolTips Feature Request

dotnet/fsharp#5300 · 0 comments · 2 reactions · 0 assignees · Indexed Sep 15, 2026
Unused opens false positive: extension method is preferred to instance method Open

Area-LangService-UnusedOpens Bug Impact-Low

dotnet/fsharp#5306 · 4 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Code attribute with literal constant demands parenthesis Open

Area-Compiler-Syntax Feature Improvement

dotnet/fsharp#5316 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Mutable use binding compiles Open

Area-Compiler-Checking Feature Improvement

dotnet/fsharp#5341 · 11 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Byref-like error message improvements Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#5351 · 7 comments · 4 reactions · 0 assignees · Indexed Sep 15, 2026
Code Generation for Record.CompareTo(object) lacks type-safety checks Open

Area-Compiler-HashCompare Feature Improvement

dotnet/fsharp#5379 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Code Generation for Record.CompareTo(object, IComparer) lacks type-safety checks, and casts before checking nulls Open

Area-Compiler-HashCompare Feature Improvement

dotnet/fsharp#5380 · 18 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
Type declaration isn't type checked when type inherits unknown type Open

Area-Diagnostics Feature Improvement

dotnet/fsharp#5399 · 7 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
[From VSTS] Getting ref to static mutable field is an error in F# 4.5 Open

Feature Request Needs-RFC

dotnet/fsharp#5420 · 6 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026
F# ignores custom modifiers (modreq/modopt) Open

Area-Compiler-CodeGen Feature Improvement

dotnet/fsharp#5464 · 0 comments · 0 reactions · 0 assignees · Indexed Sep 15, 2026

dotnet/fsharp

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