`[TupleElementNames]` Cannot be Emitted

[JasonBock]

To reproduce:

public interface IUseTuples
{
  (nint Display, nuint Window)? X11 { get; }
}

var expectations = Rock.Create<IUseTuples>();

This will give errors like:

Error - Id: CS8138, Description: Rocks\Rocks.RockCreateGenerator\INativeWindow_Rock_Create.g.cs(57,5): error CS8138: Cannot reference 'System.Runtime.CompilerServices.TupleElementNamesAttribute' explicitly. Use the tuple syntax to define tuple names.

When a member uses a tuple, it emits a TupleElementNamesAttribute on the member. The mock types can't emit these.

This was found on Silk.NET.Core.Contexts.INativeWindow