I want to create a static abstract member in an interface within a .NET Standard 2.1 project. Everything I’ve read says that this just requires C#11. I set the LangVersion tag in the project file but I get the error:

I want to create a static abstract member in an interface within a .NET Standard 2.1 project. Everything I’ve read says that this just requires C#11. I set the LangVersion tag in the project file but I get the error:

I want to create a static abstract member in an interface within a .NET Standard 2.1 project. Everything I’ve read says that this just requires C#11. I set the LangVersion tag in the project file but I get the error: