(must-be-listened-by obj place 'player 'moving-enemy 'moving-item)
(call-next-method))
+(defmethod add-object ((obj teleporter) (place room))
+ (must-be-listened-by obj place 'player)
+ (call-next-method))
+
(defmethod add-object ((obj moving-enemy) (place room))
(i-wanna-listen-to obj place 'player 'stone)
(must-be-listened-by obj place 'player)