FS0193: The module/namespace 'Fabulous' from compilation unit 'Fabulous' did not contain the val 'ValLinkagePartialKey(Create)'

[Liminiens]

I guess that it is an internal error from FSC, so I post here :)

Repro steps

1. Create a Fabulous project
2. Add Fabulous.XamarinForms.FFImageLoading
3. Add CachedImage from Fabulous.XamarinForms.FFImageLoading namespace to view function
4. Try to build
5. Get error in the title

or

build CollectionView.fsproj from repro

CollectionView.zip

Expected behavior

Build is OK.

Actual behavior

FS0193: The module/namespace 'Fabulous' from compilation unit 'Fabulous' did not contain the val 'ValLinkagePartialKey(Create)'

Known workarounds

None, yet

Related information

VisualStudio.16.Release/16.6.0+30114.105
Microsoft .NET Framework
Version 4.8.03752

Visual C++ 2019   00433-90000-00004-AA050
Microsoft Visual C++ 2019

ASP.NET and Web Tools 2019   16.6.936.3669
ASP.NET and Web Tools 2019

ASP.NET Core Razor Language Services   16.1.0.2020603+b3ac44798c16fff5b95dbcfe62dea84aa9a1bd72
Provides languages services for ASP.NET Core Razor.

ASP.NET Web Frameworks and Tools 2019   16.6.936.3669
For additional information, visit https://www.asp.net/

Azure App Service Tools v3.0.0   16.6.936.3669
Azure App Service Tools v3.0.0

Azure Functions and Web Jobs Tools   16.6.936.3669
Azure Functions and Web Jobs Tools

C# Tools   3.6.0-4.20251.5+910223b64f108fcf039012e0849befb46ace6e66
C# components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Common Azure Tools   1.10
Provides common services for use by Azure Mobile Services and Microsoft Azure Tools.

Extensibility Message Bus   1.2.0 (d16-2@8b56e20)
Provides common messaging-based MEF services for loosely coupled Visual Studio extension components communication and integration.

File Icons   2.7
Adds icons for files that are not recognized by Solution Explorer

File Nesting   2.6.85
Automatically nest files based on file name and enables developers to nest and unnest any file manually

FileStructureTW Extension   1.0
FileStructureTW Visual Studio Extension Detailed Info

IntelliCode Extension   1.0
IntelliCode Visual Studio Extension Detailed Info

Microsoft Azure Tools   2.9
Microsoft Azure Tools for Microsoft Visual Studio 2019 - v2.9.30212.1

Microsoft Continuous Delivery Tools for Visual Studio   0.4
Simplifying the configuration of Azure DevOps pipelines from within the Visual Studio IDE.

Microsoft JVM Debugger   1.0
Provides support for connecting the Visual Studio debugger to JDWP compatible Java Virtual Machines

Microsoft Library Manager   2.1.50+g25aae5a24a.R
Install client-side libraries easily to any web project

Microsoft MI-Based Debugger   1.0
Provides support for connecting Visual Studio to MI compatible debuggers

Microsoft Visual C++ Wizards   1.0
Microsoft Visual C++ Wizards

Microsoft Visual Studio Tools for Containers   1.1
Develop, run, validate your ASP.NET Core applications in the target environment. F5 your application directly into a container with debugging, or CTRL + F5 to edit & refresh your app without having to rebuild the container.

Microsoft Visual Studio VC Package   1.0
Microsoft Visual Studio VC Package

Mono Debugging for Visual Studio   16.6.17 (9692114)
Support for debugging Mono processes with Visual Studio.

NuGet Package Manager   5.6.0
NuGet Package Manager in Visual Studio. For more information about NuGet, visit https://docs.nuget.org/

ProjectServicesPackage Extension   1.0
ProjectServicesPackage Visual Studio Extension Detailed Info

Snapshot Debugging Extension   1.0
Snapshot Debugging Visual Studio Extension Detailed Info

SQL Server Data Tools   16.0.62004.28040
Microsoft SQL Server Data Tools

TypeScript Tools   16.0.20417.2002
TypeScript Tools for Microsoft Visual Studio

Visual Basic Tools   3.6.0-4.20251.5+910223b64f108fcf039012e0849befb46ace6e66
Visual Basic components used in the IDE. Depending on your project type and settings, a different version of the compiler may be used.

Visual F# Tools 10.9.1.0 for F# 4.7   16.6.0-beta.20217.4+1c969cac25e2d38d71872efe6c8226029e42bb59
Microsoft Visual F# Tools 10.9.1.0 for F# 4.7

Visual Studio Code Debug Adapter Host Package   1.0
Interop layer for hosting Visual Studio Code debug adapters in Visual Studio

Visual Studio Container Tools Extensions (Preview)   1.0
View, manage, and diagnose containers within Visual Studio.

Visual Studio Tools for Containers   1.0
Visual Studio Tools for Containers

VisualStudio.DeviceLog   1.0
Information about my package

VisualStudio.Foo   1.0
Information about my package

VisualStudio.Mac   1.0
Mac Extension for Visual Studio

Xamarin   16.6.000.1055 (d16-6@2873694)
Visual Studio extension to enable development for Xamarin.iOS and Xamarin.Android.

Xamarin Designer   16.6.0.318 (remotes/origin/d16-6@66afc5421)
Visual Studio extension to enable Xamarin Designer tools in Visual Studio.

Xamarin Templates   16.6.40 (1f1466f)
Templates for building iOS, Android, and Windows apps with Xamarin and Xamarin.Forms.

Xamarin.Android SDK   10.3.1.0 (d16-6/3fe860a)
Xamarin.Android Reference Assemblies and MSBuild support.
    Mono: 165f4b0
    Java.Interop: xamarin/java.interop/d16-6@2cab35c
    ProGuard: xamarin/proguard/master@905836d
    SQLite: xamarin/sqlite/3.31.1@49232bc
    Xamarin.Android Tools: xamarin/xamarin-android-tools/d16-6@bfb66f3


Xamarin.iOS and Xamarin.Mac SDK   13.18.1.31 (b3eedfe)
Xamarin.iOS and Xamarin.Mac Reference Assemblies and MSBuild support.

ZenCoding   1.2.12
Provides ZenCoding for the HTML Editor - full support for static HTML, Razor and WebForms.

[Happypig375]

Shouldn't this issue be in the Fabulous repository?

[Liminiens]

If it’s not a fsc issue then the issue should be moved. But now it looks like an internal error in compiler.

[cartermp]

This is likely the same problem as #6450 surfacing in a different way

[cartermp]

@dsyme any thoughts here?

[dsyme]

The Fabulous sample project was using an invalid mix of versions of Fabulus components that were not binary comptible, see fabulous-dev/Fabulous#795 (comment)