anchor.diff:  String gold_color = "#FFD700";
   String white_color = "#FFFFFF";
   
  -
  +void renderSquare(final Coord c, final String color) {
  +   canvas.fillStyle = color;
  +   canvas.fillRect(width * c.getX(), height * c.getY(), width, height);
  +}
   
   class Gold {
     Coord location;
  
positive.code: }
  
  
  
  // Subclassing GameLoopState allows you to organise the state of your game
  // without poluting the global state.
  class SnakeState extends GameLoopHtmlState {
    String name;
    Snake snake;
  
negative.code:     setNewLocation();
    }
  
    Coord getLocation() {
      return location;
    }
  
  
  