public override void ExecuteInternal(RPNStack rpn, Types dataType)
{
int i1 = int.Parse(rpn.Pop().Token);
if (rpn.Count < i1)
{
rpn.Push(i1.ToString(), Types.Integer);
throw new ArgumentException("Too few arguments");
}
StackItem[] stk = new StackItem[i1];
Array.Copy(rpn.ToArray(), rpn.Count - i1, stk, 0, i1);
while (--i1 >= 0)
{
rpn.Push(stk[i1]);
}
}