anchor.diff:  
   (eval-when (:compile-toplevel :load-toplevel :execute)
     (defclass gobject (ginstance)
  -    ()
  +    (#+debug-ref-counting
  +     (ref-count :allocation :alien :type int :reader ref-count))
       (:metaclass gobject-class)
       (:gtype "GObject")))
  +
  +#+debug-ref-counting
  +(defmethod print-object ((instance gobject) stream)
  +  (print-unreadable-object (instance stream :type t :identity nil)
  +    (if (slot-boundp instance 'location)
  +	(format stream "at 0x~X (~D)" (sap-int (foreign-location instance)) (ref-count instance))
  +      (write-string "at \"unbound\"" stream))))
   
   
   (defun initial-add (object function initargs key pkey)
  
positive.code: ;; TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
  ;; SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
  
  ;; $Id: gobject.lisp,v 1.43 2006-02-05 15:38:57 espen Exp $
  
  (in-package "GLIB")
  
  
negative.code: ;;;; Metaclass used for subclasses of gobject
  
  (eval-when (:compile-toplevel :load-toplevel :execute)
  ;;   (push :debug-ref-counting *features*)
    (defclass gobject-class (ginstance-class)
      ((instance-slots-p :initform nil
        :documentation "Non NIL if the class has slots with instance allocation")))
  