anchor.diff:  
   (defun draw()
     (gl:clear :color-buffer)
  -  (draw-object *snake*)
  +  (draw-snake *snake*)
     (sdl2:gl-swap-window *window*))
   
   (defun main-loop ()
  
positive.code:   (setf *last-fps-message-time* (sdl2:get-ticks))
  
    ;; Init snake
    (init-object *snake*))
  
  (defun update-fps ()
    (incf *frame-count*)
  
negative.code: 
  (defun update (delta-t)
    (if *running*
        (update-snake *snake* delta-t))
    (update-fps)
    
    ;; Change angle
  