message: Remove changing value for Const operand in expression
diff: @@ -230,9 +230,6 @@ export class Const extends Operand {
  public getType(): string {
  return "const";
  }
  - public setValue(val: any): void {
  - this.value = val;
  - }
  public toString(func: (op: Operand) => string = undefined): string {
  if (!!func) {
  var res = func(this);
  