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The F# compiler, F# core library, F# language service, and F# tooling integration for Visual Studio

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Please provide a succinct description of the issue. Version `6.0.5` of the `FSharp.Core` library seems to have two different contents depending on where it is delivered from. The version bundled...

Bug

Under .net framework FSI, I'm getting internal error: **Repro steps** ```fsharp type Foo = abstract member X : string with get, set type FooImpl = { name: string } interface...

Bug
Area-Compiler-Checking

In the example below, the type alias is not present on `map`, but is on the operator. Note that it doesn't matter whether the second binding is an operator or...

Bug
Impact-Low
Area-Compiler-Service

It's been over a year that I tried this, but, at least for me, it doesn't work out of the box. Before I'm going to try to debug what's going...

Engineering

Try any of the 6 F# iOS templates from Visual Studio. **Repro steps** 1. ![image](https://user-images.githubusercontent.com/19922066/174857252-626a641e-22cc-439a-aecf-a42b4dd326bc.png) 2. ![image](https://user-images.githubusercontent.com/19922066/174857050-0e5a4252-ac16-4490-9256-0163ab0f96a1.png) **Expected behavior** Template loads successfully without error dialogs. **Actual behavior** An error dialog...

Resolution-External

VS17.2.3 is unable to create new F# Xamarin Android projects. All 3 throw null reference exception when tried. **Repro steps** Try any of these 3 templates. ![image](https://user-images.githubusercontent.com/19922066/174856354-7d708882-a87c-4a24-ae33-6ecfad21c83e.png) **Expected behavior** A...

Resolution-External

Trying to assign a protected property at the constructor call of an inherit clause fails with an accessibility error. **Repro steps** ```csharp public class Foo { protected string Value {...

Bug
Area-Compiler-Checking

_This issue has been moved from [a ticket on Developer Community](https://developercommunity.visualstudio.com/t/F-Go-to-definition-does-not-display-a/10038353)._ --- If you open the definition of any attribute in C# you will see ``` C# // // Summary:...

Impact-Low
Feature Improvement
Area-LangService-Navigation

Hello, while working on a binding for Fable I encounter a case with a huge number elements to map, around 13 000. Depending on how I represents those elements the...

Feature Improvement
Theme-Performance
Area-Compiler-CodeGen

Large projects can benefit from signature files due to an optimization in FCS that skips type checking for files that have a matching signature file. https://github.com/dotnet/fsharp/blob/36af364b538cde99d8de8df93db241af53329f22/src/Compiler/Driver/ParseAndCheckInputs.fs#L1211-L1229 This solution could make...

Feature Request
Area-LangService-QuickFixes