anchor.diff:      setNewLocation();
     }
   
  -  void render(CanvasRenderingContext2D crc) {
  -    location.render(crc, gold_color);
  +  Coord getLocation() {
  +    return location;
     }
   
   
  
positive.code: 
  // Create a CustomState class with unique state properties
  
  
  // const num x = 10;
  // const num y = 10;
  const num width = 10;
  const num height = 10;
  num initialPauseInMillis = 400;
  
negative.code:     canvas.strokeText("Inside snake pen", 0, 100);
  
      canvas.fillRect(0, 0, 20, 20);
      renderSquare(gold.getLocation(), gold_color);
      // XXX gold.render(canvas);
      snake.render(canvas);
  
      snake.showPoints();
  