Instructions: first select the next line and press the "do it" button.
This will change the language of this workspace to Worlds/JS. 

   include("Worlds2_Compiled")

Now you should be able to run the example below. (Just select the code
and press "do it".)

  X = function() { }
  X.prototype = {y: 42}

  A = thisWorld;
  B = A.sprout();
  C = B.sprout();
  p = new X();                // Where X has a prototype that 
                          // sets a property y to value 42
  in B {
    p.y = 0;
  }
  in C {
    alert(p.y);
  }