anchor.diff:     #:walk-lambda-list
      #:walk-implict-progn
      #:body
  -   #:cleanup-form
  +   #:cleanup-form-of
      #:code-of
  -   #:consequent
  +   #:condition-of
      #:declares
  -   #:default-value
  -;; #:else ; iterate
  +   #:default-value-of
  +   #:else-of
      #:enclosing-tagbody-of
      #:eval-when-times
  -   #:first-form
  -   #:func
  +   #:first-form-of
  +   #:function-designator-of
      #:keyword-name
      #:name-of
  -   #:other-forms
  +   #:other-forms-of
      #:parent
  -   #:protected-form
  +   #:protected-form-of
      #:read-only-p
      #:result
      #:source
  
positive.code:    #:tag
     #:target-block-of
     #:jump-target-of
     #:then
     ;;#:type-of
     #:value-of
     #:values-form
     #:variable-name-of
     #:vars-form
  
     ))
  
negative.code:    ;;; walker
     ;;;
     #:form
     #:walk-ast
     #:walk-form
     #:unwalk-form
     #:unwalk-forms
  