/// <summary>
        /// We have determined that our right-hand operand is another binary operator, and its
        /// left-hand operand is a constant that can be combined with our left-hand operand.
        /// Now we want to set the left-hand operand of that other operator to the newly-
        /// combined constant value, and then rotate it up -- replace our binary operator
        /// with this newly-modified binary operator, and then attempt to re-evaluate it.
        /// </summary>
        /// <param name="binaryOp">the binary operator that is our right-hand operand</param>
        /// <param name="newLiteral">the newly-combined literal</param>
        private void RotateFromRight(BinaryOperator node, BinaryOperator binaryOp, ConstantWrapper newLiteral)
        {
            // replace our node with the binary operator
            binaryOp.ReplaceChild(binaryOp.Operand1, newLiteral);
            node.Parent.ReplaceChild(node, binaryOp);

            // and just for good measure.. revisit the node that's taking our place, since
            // we just changed a constant value. Assuming the other operand is a constant, too.
            ConstantWrapper otherConstant = binaryOp.Operand2 as ConstantWrapper;
            if (otherConstant != null)
            {
                EvalThisOperator(binaryOp, newLiteral, otherConstant);
            }
        }