[Bug]: WriteCodeFragment - assembly attribute doesn't work for F#

[Evangelink]

Issue Description

Not sure if that's by-design and the doc is only missing some sections or if that's a bug.

As part of maintenance on test-templates, I am trying to enable parallelize assembly attribute by default using the <AssemblyAttribute.../> syntax in the project. I have been able to successfully provide the implementation for C# and VB.NET but F# is failing with Unable to parse '1_IsLiteral' as an index.

Steps to Reproduce

• Create a new F# MSTest project: dotnet new mstest --language F#

• Edit the fsproj by adding:

<AssemblyAttribute Include="Microsoft.VisualStudio.TestTools.UnitTesting.Parallelize">
  <_Parameter1>Workers = 0</_Parameter1>
  <_Parameter1_IsLiteral>true</_Parameter1_IsLiteral>
  <_Parameter2>Scope = Microsoft.VisualStudio.TestTools.UnitTesting.ExecutionScope.MethodLevel</_Parameter2>
  <_Parameter2_IsLiteral>true</_Parameter2_IsLiteral>
</AssemblyAttribute>

• Build: dotnet build

Error:

<redacted>\FSharp\Microsoft.FSharp.Overrides.NetSdk.targets(30,5): error : Unable to parse '1_IsLiteral' as an index [<redacted>\
project.fsproj]

Expected Behavior

Feature is supported or doc and error is improved to specify this is not supported.

Actual Behavior

<AssemblyAttribute.../> syntax in the project. I have been able to successfully provide the implementation for C# and VB.NET but F# is failing with Unable to parse '1_IsLiteral' as an index.

Analysis

No response

Versions & Configurations

No response

[KalleOlaviNiemitalo]

F# has its own WriteCodeFragment task implementation that does not support the "_TypeName" and "_IsLiteral" suffixes. https://github.com/dotnet/fsharp/blob/v12.8.0/src/FSharp.Build/WriteCodeFragment.fs

[KalleOlaviNiemitalo]

Also noted in #6285 (comment).

I think it would be best to document at WriteCodeFragment task that "_TypeName" and "_IsLiteral" are only implemented for CodeDom supported languages, i.e. C# and VB. If the F# implementation of WriteCodeFragment is ever changed to support these too, then the documentation can be updated at that time, and it can state the version of F# in which this support is added.

[Evangelink]

Thanks for the pointers @KalleOlaviNiemitalo! I am closing this issue then.