[VS2022] "Stream does not support writing"

[0x53A]

I got this error after updating from preview 4 to preview 5.
It only happens when building inside VS, not when using dotnet build from the command line.

Build started...
1>------ Build started: Project: ebosYC.CarouselView3D.RemotingContracts, Configuration: Debug Any CPU ------
1>FSC : error FS0229: Error opening binary file 'C:\Users\Lukas\.nuget\packages\fsharp.core\4.1.18\lib\net40\FSharp.Core.dll': Stream does not support writing.
1>FSC : error FS3160: Problem reading assembly 'C:\Users\Lukas\.nuget\packages\fsharp.core\4.1.18\lib\net40\FSharp.Core.dll': The exception has been reported. This internal exception should now be caught at an error recovery point on the stack. Original message: Error opening binary file 'C:\Users\Lukas\.nuget\packages\fsharp.core\4.1.18\lib\net40\FSharp.Core.dll': Stream does not support writing.)
1>error FS0073 : internal error : BuildFrameworkTcImports: no successful import of C:\Users\Lukas\.nuget\packages\fsharp.core\4.1.18\lib\net40\FSharp.Core.dll
1>Done building project "ebosYC.CarouselView3D.RemotingContracts.fsproj" -- FAILED.
1>ebosYC.CarouselView3D.RemotingContracts -> C:\Projekte\ebos\ebosYCRemotingContracts\ebosYC.CarouselView.RemotingContracts\bin\Debug\net5.0\ebosYC.CarouselView3D.RemotingContracts.dll

For me this is reproducible when creating a new F# project and then pasting this project file:

<Project Sdk="Microsoft.NET.Sdk">

	<PropertyGroup>
		<TargetFrameworks>net40</TargetFrameworks>

		<DisableImplicitFSharpCoreReference>true</DisableImplicitFSharpCoreReference>
		<DisableImplicitSystemValueTupleReference>true</DisableImplicitSystemValueTupleReference>
		<OutputType>Exe</OutputType>
	</PropertyGroup>

	<ItemGroup>
		<PackageReference Include="FSharp.Core" Version="4.1.18" />
		<Compile Include="Program.fs" />
	</ItemGroup>

</Project>

I think it's related to the .net40 TFM?

Related information

Provide any related information (optional):

• Operating system: windows 10 2004 x64
• .NET Runtime kind (.NET Core, .NET Framework, Mono)

.NET SDK (reflecting any global.json):
 Version:   5.0.402
 Commit:    e9d3381880

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.19041
 OS Platform: Windows
 RID:         win10-x64
 Base Path:   C:\Program Files\dotnet\sdk\5.0.402\

Host (useful for support):
  Version: 6.0.0-rc.2.21480.5
  Commit:  6b11d64e7e

.NET SDKs installed:
  3.1.414 [C:\Program Files\dotnet\sdk]
  5.0.208 [C:\Program Files\dotnet\sdk]
  5.0.303 [C:\Program Files\dotnet\sdk]
  5.0.401 [C:\Program Files\dotnet\sdk]
  5.0.402 [C:\Program Files\dotnet\sdk]
  6.0.100-preview.7.21379.14 [C:\Program Files\dotnet\sdk]
  6.0.100-rc.2.21505.57 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.19 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.20 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.11 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0-preview.7.21378.6 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.0-rc.2.21480.10 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.19 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.20 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.7 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.11 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0-preview.7.21377.19 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.0-rc.2.21480.5 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.19 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 3.1.20 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.4 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.5 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.10 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.11 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0-preview.7.21378.9 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.0-rc.2.21501.6 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

To install additional .NET runtimes or SDKs:
  https://aka.ms/dotnet-download

• Editing Tools (e.g. Visual Studio Version, Visual Studio): VS2022 Preview 5

[vzarytovskii]

I'll look into it.

We were using CoreCLR compiler in preview4, and switched back to desktop one with preview5. Same reason why it's failing in VS and not with dotnet build.

[vzarytovskii]

Interestingly enough, it doesn't reproduce on net452.

[0x53A]

the good news is that <FSharpPreferNetFrameworkTools>false</FSharpPreferNetFrameworkTools> works, so I'm not blocked.