(defsystem "car-game"
 :components ((:file "packages") 
              (:file "macros" :depends-on ("packages"))
              (:file "side-effects" :depends-on ("macros"))
              (:file "car-game" :depends-on ("side-effects"))
              (:module "examples" :depends-on ("car-game")
                      :components ((:file "examples")))))