anchor.diff:     :bound-key-up-p
      :bind-key-up
      :unbind-key-up
  -   :actor
   
      ;; game.lisp
      :game
  
positive.code:    :update
     :sprite
     :image
     :mobile
     :veloc
     :accel
  
     ;; actor.lisp
     :event
     :event-type
     :event-mixin
  
negative.code:    :save-game
     :send
     :update-game
  
     ;; actor.lisp
     :actor
     :mobile
     :veloc
     :accel
  
     ))
  
  