public ref CustomClassConsumable <string> RefReturnClassCase3(CustomClassConsumable <string> x, ref string y, double?z) => ref _refResultHolder3;
public ref CustomClassConsumable <int> RefReturnClassCase2(CustomClassConsumable <int> x, ref string y, double?z) => ref _refResultHolder2;
public CustomClassConsumable <string> ClassCase3(CustomClassConsumable <string> x, ref string y, double?z) => default;
public CustomClassConsumable <int> ClassCase2(CustomClassConsumable <int> x, ref string y, double?z) => default;