// example 2

<'
extend fruits {
   mangos : uint;
   papayas : uint;   
   sum_fruits_up() : return uint is also {
      result += mangos + papayas; 
      // the last value written into result is the one that will be returned from the 
      // method. Note that if in the original method I would have written instead: 
      // return apples + oranges;
      // I would not have been able to extend it.
   };         
};
'>