This package contains missing items that allows you to use the latest C# language features in .NET Framework and Standard.
- CompilerFeatureRequiredAttribute
- IsExternalInit
- RequiredMemberAttribute
- SetsRequiredMembersAttribute
Can be installed from Nuget Package Manager in Visual Studio. https://www.nuget.org/packages/MissingAttributes
Or adding the following to your csproj file.
<PackageReference Include="MissingAttributes" Version="X.Y.Z" />