Fixes xunit/xunit#2798: xUnit2007 code fix leads to CS8920 compiler error

[etherfield]

Resolves #2798

[boerdereinar]

Does not work when adding extra abstraction layer:

public interface IInterface1 {
    public abstract void Method();
}

public interface IInterface2 : IInterface1 {
}

Also this is supported in .NET 7, but not as a preview in .NET 6.
Edit: Removed irrelevant info.

[bradwilson]

Thanks!

I assume the language preview features used here are all coming in C# 12? If so, then I'll just wait until C# 12 is released to add this. Should only be a few weeks days...

[bradwilson]

It appears this feature is not in C# 12, as it's still open: dotnet/csharplang#4436

[boerdereinar]

@bradwilson This feature has already been introduced in C# 11, not C# 12. I have no idea why the proposal is still open. See https://learn.microsoft.com/en-us/dotnet/csharp/whats-new/tutorials/static-virtual-interface-members and https://github.com/dotnet/csharplang/blob/main/proposals/csharp-11.0/static-abstracts-in-interfaces.md

[bradwilson]

If you attempt to use it, you get told you must "enable preview features" which require attribute decoration of any affected type (or the assembly as a whole):

[bradwilson]

Note that this is with .NET SDK 8 and C# 12.

[bradwilson]

Maybe it's runtime-dependent?

[boerdereinar]

The target framework in that screenshot is .NET 6. You set it to at least .NET 7 in order for it to work.

[bradwilson]

Thanks!