namespace System
{
    [RequiresPreviewFeatures("Generic Math is in preview.", Url = "https://aka.ms/dotnet-warnings/generic-math-preview")]
    public interface ISubtractionOperators<TSelf, TOther, TResult>
        where TSelf, ISubtractionOperators<TSelf, TOther, TResult>!
    {
        static TResult operator -(TSelf left, TOther right);
    }
}