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dotnet / fsharp Public

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Fork 865
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Issues 1.1k
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•Last updated Jun 20, 2026

General bucket. When items are completed or fixed, they are moved to a release milestone.

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Select all issues: List view

0 issues of 1055 selected

Open
(1,055)
Closed
(1,573)

VerificationException on runtime, due to upcast to obj inside the task state machine

Area-Compiler-StateMachinesSequence, list, task and other state machine compilationSequence, list, task and other state machine compilation

Impact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.

Status: Open.

#16154 In dotnet/fsharp;

· Thorium opened

on Oct 22, 2023

Mutually recursive non-function values with intermediate module definition not initialized incorrectly

Area-Compiler-CodeGenIlxGen, ilwrite and things at the backendIlxGen, ilwrite and things at the backend

Impact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.

Status: Open.

#12384 In dotnet/fsharp;

· brianberns opened

on Nov 13, 2021

Errors when using different versions of the same package with type providers in the same solution

Status: Open.

#11135 In dotnet/fsharp;

· DedSec256 opened

on Feb 21, 2021

Wishlist: quick fix for "possible incorrect indentation"

Area-LangService-CodeFixesCode fixes associated with diagnosticsCode fixes associated with diagnostics

Feature Request

Status: Open.

#2834 In dotnet/fsharp;

· vivainio opened

on Apr 11, 2017

WebApplicationFactory<Program> can only be used with workaround in F# aspnet integration tests

Status: Open.

#18302 In dotnet/fsharp;

· jkone27 opened

on Feb 9, 2025

Distracting and not helpful error toast in VS on `OperationCanceled`

Area-VS-EditorVS editor support for F# code, not covered elsewhereVS editor support for F# code, not covered elsewhere

Feature Improvement

Status: Open.

#17887 In dotnet/fsharp;

· vsfeedback opened

on Oct 16, 2024

Nullness - Consider supporting Nullable shorthand for TreatWarningsAsErrors

Area-NullnessIssues related to handling of Nullable Reference TypesIssues related to handling of Nullable Reference Types

Feature Request

good first issue

Status: Open.

#17524 In dotnet/fsharp;

· BoundedChenn31 opened

on Aug 12, 2024

[generics/error message] `?typeid` shown in error message for missing type constraint

Impact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.

Status: Open.

#6725 In dotnet/fsharp;

· smoothdeveloper opened

on May 14, 2019

Transparent compiler: test that TC reuses check results after project modifications

Area-Experimental-Features

Feature Request

Transparent-Compiler

Status: Open.

#16823 In dotnet/fsharp;

· auduchinok opened

on Mar 6, 2024

FS0236 "Directives inside modules are ignored" is incomplete and gives the wrong impression, directives inside modules are often allowed

Area-Diagnosticsmistakes and possible improvements to diagnosticsmistakes and possible improvements to diagnostics

Feature Improvement

Status: Open.

#3486 In dotnet/fsharp;

· abelbraaksma opened

on Aug 22, 2017

Syntax-coloring is not applied or removed when changing Build Action from None to Compile and vv

AI-thinks-windows-only

Area-LangService-Colorization

Impact-Medium(Internal MS Team use only) Describes an issue with moderate impact on existing code.(Internal MS Team use only) Describes an issue with moderate impact on existing code.

Status: Open.

#3503 In dotnet/fsharp;

· abelbraaksma opened

on Aug 25, 2017

Operators starting with '>' don't get IDE features

AI-thinks-windows-only

Area-LangService-Colorization

Impact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.

Status: Open.

#3462 In dotnet/fsharp;

· cartermp opened

on Aug 18, 2017

Duplicate cases in match statement not producing compiler warnings if grouped

Area-Compiler-PatternMatchingpattern compilation, active patterns, performance, codegenpattern compilation, active patterns, performance, codegen

Status: Open.

#3448 In dotnet/fsharp;

· neildanson opened

on Aug 17, 2017

Type annotation adjacency warning doesn't consider operator names

Area-Compiler-Syntaxlexfilter, indentation and parsinglexfilter, indentation and parsing

Impact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.

Status: Open.

#774 In dotnet/fsharp;

· frankshearar opened

on Dec 8, 2015

Better errors message when exception raised in ProvidedTypeDefinition.AddMembersDelayed

Area-TypeProviders

Impact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.

Status: Open.

#710 In dotnet/fsharp;

· dmitry-a-morozov opened

on Nov 2, 2015

Unions with 4 or more cases silently fail to utilize UseNullAsTrueValue.

Area-Compiler-CheckingType checking, attributes and all aspects of logic checkingType checking, attributes and all aspects of logic checking

Impact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.

Status: Open.

#711 In dotnet/fsharp;

· bryanedds opened

on Nov 4, 2015

Emit a warning when referencing console applications exe's without a main

Area-Diagnosticsmistakes and possible improvements to diagnosticsmistakes and possible improvements to diagnostics

Impact-Medium(Internal MS Team use only) Describes an issue with moderate impact on existing code.(Internal MS Team use only) Describes an issue with moderate impact on existing code.

Theme-Simple-F#A cross-community initiative called "Simple F#", keeping people in the sweet spot of the language.A cross-community initiative called "Simple F#", keeping people in the sweet spot of the language.

Status: Open.

#602 In dotnet/fsharp;

· tldrlol opened

on Aug 23, 2015

Generic Record Types have different Equality semantics to concrete types

Area-Compiler-OptimizationThe F# optimizer, release code gen etc.The F# optimizer, release code gen etc.

Impact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.

Status: Open.

#527 In dotnet/fsharp;

· manofstick opened

on Jul 8, 2015

Incorrect result of Equals involving NaN in structural type nested in generic structural type

Area-LibraryIssues for FSharp.Core not covered elsewhereIssues for FSharp.Core not covered elsewhere

Feature Improvement

Status: Open.

#556 In dotnet/fsharp;

· exercitusvir opened

on Jul 25, 2015

Instantiating a generative type provider twice results in invalid IL

Area-TypeProviders

Impact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.

Status: Open.

#37 In dotnet/fsharp;

· KevinRansom opened

on Jan 18, 2015

Problem: Unlike C#, the F# compiler allows multiple entries of assembly attributes

Area-Compiler-CheckingType checking, attributes and all aspects of logic checkingType checking, attributes and all aspects of logic checking

Impact-Low(Internal MS Team use only) Describes an issue with limited impact on existing code.(Internal MS Team use only) Describes an issue with limited impact on existing code.

Status: Open.

#3548 In dotnet/fsharp;

· BentTranberg opened

on Sep 3, 2017

Make FSharp.Core safe for SQL CLR with IL initonly (somehow) on static field 'empty' in Map

Feature Request

Status: Open.

#3535 In dotnet/fsharp;

· SomethingAwry opened

on Sep 1, 2017

[Diagnostics] Better error message for conversion of fun to System.Func

Area-Diagnosticsmistakes and possible improvements to diagnosticsmistakes and possible improvements to diagnostics

Feature Improvement

Status: Open.

#3568 In dotnet/fsharp;

· 0x53A opened

on Sep 11, 2017

Module marked with ModuleSuffix attribute is hidden by another module with the same name

Area-Compiler-CheckingType checking, attributes and all aspects of logic checkingType checking, attributes and all aspects of logic checking

Area-Compiler-Checking-NameResolutionModule/type name collisions, open behavior, shadowing, global namespaceModule/type name collisions, open behavior, shadowing, global namespace

Feature Improvement

Status: Open.

#3565 In dotnet/fsharp;

· vasily-kirichenko opened

on Sep 9, 2017

Simplify Name should not simplify RQA

Area-LangService-DiagnosticsFCS code analysis, diagnostics, red squiggliesFCS code analysis, diagnostics, red squigglies

Feature Improvement

Status: Open.

#3778 In dotnet/fsharp;

· forki opened

on Oct 19, 2017

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