anchor.diff:     #:constant-form
      #:variable-reference-form
      #:lexical-variable-reference-form
  +   #:walked-lexical-variable-reference-form
      #:unwalked-lexical-variable-reference-form
      #:free-variable-reference-form
  +
      #:application-form
      #:lexical-application-form
      #:walked-lexical-application-form
      #:unwalked-lexical-application-form
      #:free-application-form
      #:lambda-application-form
  +
  +   #:function-object-form
  +   #:lexical-function-object-form
  +   #:walked-lexical-function-object-form
  +   #:unwalked-lexical-function-object-form
  +   #:free-function-object-form
  +
      #:function-form
      #:lambda-function-form
  -   #:function-object-form
  -   #:walked-lexical-function-object-form
  -   #:free-function-object-form
  -   #:unwalked-lexical-function-object-form
      #:function-argument-form
      #:required-function-argument-form
      #:specialized-function-argument-form
  
positive.code:    ;;; walker
     ;;;
     #:form
     #:walk-form
     #:unwalk-form
     #:unwalk-forms
  
negative.code:    #:walk-lambda-list
     #:walk-implict-progn
     #:body
     #:cleanup-form-of
     #:code-of
     #:condition-of
     #:declares
     #:default-value-of
     #:else-of
     #:enclosing-tagbody-of
     #:eval-when-times
     #:first-form-of
     #:function-designator-of
     #:keyword-name
     #:name-of
     #:other-forms-of
     #:parent
     #:protected-form-of
     #:read-only-p
     #:result
     #:source
  