anchor.diff:      }
   
       // If we're not at max length, then grow length
  +    print("coords.length = ${coords.length}");
  +    print("maxSize = ${maxSize}");
       if (coords.length == maxSize) {
         print("Maintaining  tail");
         coords.removeAt(0);
  
positive.code: 
    void render(canvas) {
      coords.forEach((c) => c.render(canvas, "#FFFFFF"));
    }
  }
  
  
negative.code:   String name;
    Snake snake;
    int speed;
    int tailClock;
  
    static Coord right = new Coord(1, 0);
    static Coord left = new Coord(-1, 0);
  