old_contents: /**
   * @constructor
   * @extends Yo.parent
   */
  Yo.child = function () {
  };
  
  /**
   * @override
   */
  Yo.child.prototype.anotherMEth = function() {
      Yo.parent.prototype.anotherMEth.call(this);
  };
  
new_contents: /**
   * @constructor
   * @extends Yo.parent
   */
  Yo.child = function () {
  };
  
subject: remove override