message: Make expression operand property public in UnaryOperand,
diff: @@ -116,7 +116,7 @@ export class BinaryOperand extends Operand {
  export class UnaryOperand extends Operand {
  private consumer: Function;
  - constructor(private expression: Operand, private operatorName: string) {
  + constructor(private expressionValue: Operand, private operatorName: string) {
  super();
  this.consumer = OperandMaker.unaryFunctions[operatorName];
  if (this.consumer == null) {
  @@ -126,6 +126,9 @@ export class UnaryOperand extends Operand {
  public get operator(): string {
  return this.operatorName;
  }
  + public get expression(): Operand {
  + return this.expressionValue;
  + }
  public getType(): string {
  return "unary";
  }
  