anchor.diff:  use."
     prim prev-stage)
   
  +(deferror test-stage-invalid () (errors)
  +    "Varjo: Code provided not valid for any stage:~{~%~s~}"
  +  errors)
  +
   ;;
   ;; Hi! Don't forget to add the name of your condition to the
   ;; varjo.conditions package
  
positive.code:   shadow-type pairs)
  
  (deferror shadowing-constructor-no-match () (shadow-type func-id)
    "Varjo: Was asked to shadow the function with the idenifier ~a as
  a constructor for the shadow-type ~a.
  
  However no functions were found that matched this identifier."
    func-id shadow-type)
  
  (deferror def-shadow-non-func-identifier () (name func-ids)
    "Varjo: ~a was ask to shadow some functions, however the following
  identifiers are have problems:
  ~{~%~s~}
  
  
negative.code:   func-id shadow-type funcs)
  
  (deferror shadowing-multiple-funcs () (shadow-type pairs)
      "Varjo: Was asked to shadow the functions for the shadow-type ~a.
  
  However these function-identifiers name multiple functions, which is not
  allowed in this form.
  