anchor.diff:  
   ;;; This method implements the action to take when the argument is an
   ;;; ENTRY, but it is not a BLOCK entry.  We handle this situation by
  -;;; just making a recursive call, passing the next entry in the list.
  +;;; just making a recursive call, passing the next entry in the
  +;;; environment.
   (defmethod block-info ((environment entry) symbol)
     (block-info (next environment)))
   
  
positive.code: ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  ;;;
  ;;; VARIABLE-INFO
  
  
  ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
  ;;;
  
negative.code: 
  ;;; This method implements the action to take when the argument is an
  ;;; ENTRY, but it is not a TAG entry.  We handle this situation by
  ;;; just making a recursive call, passing the next entry in the
  ;;; environment.
  (defmethod tag-info ((environment entry) symbol)
    (tag-info (next environment)))
  
  