anchor.diff:  (defgeneric %process-grovel-form (name out arguments)
     (:method (name out arguments)
       (declare (ignore out arguments))
  -    (error "Unknown Grovel syntax: ~S" name)))
  +    (grovel-error "Unknown Grovel syntax: ~S" name)))
   
   (defun process-grovel-form (out form)
     (%process-grovel-form (form-kind form) out (cdr form)))
  
positive.code:   (map 'string #'identity (string s)))
  
  ;;;# Error Conditions
  
  ;;; This warning is signalled when iolib-grovel can't find some macro.
  ;;; Signalled by CONSTANT or CONSTANTENUM.
  
negative.code: (defgeneric %process-wrapper-form (name out arguments)
    (:method (name out arguments)
      (declare (ignore out arguments))
      (grovel-error "Unknown Grovel syntax: ~S" name)))
  
  ;;; OUT is lexically bound to the output stream within BODY.
  (defmacro define-wrapper-syntax (name lambda-list &body body)
  