public override bool IsEquivalentTo(AstNode otherNode)
{
// a binary operator is equivalent to another binary operator if the operator is the same and
// both operands are also equivalent
var otherBinary = otherNode as BinaryOperator;
return(otherBinary != null &&
OperatorToken == otherBinary.OperatorToken &&
Operand1.IsEquivalentTo(otherBinary.Operand1) &&
Operand2.IsEquivalentTo(otherBinary.Operand2));
}