anchor.diff:      (closure-set-meta-marshal gclosure callback-id callback)
       gclosure))
   
  -(defun make-callback-closure (function marshaller)
  +(defun make-callback-closure (function &optional (marshaller signal-handler-marshal))
     (let ((callback-id (register-callback-function function)))
       (values
        (callback-closure-new callback-id marshaller user-data-destroy-callback)
  
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: gcallback.lisp,v 1.41 2007-04-06 14:31:43 espen Exp $
  
  (in-package "GLIB")
  
  
negative.code:   (detail quark)
    (closure (or null pointer))
    (func (or null pointer))
    (data pointer-data))
  
  (defbinding signal-handler-disconnect () nil
    (instance ginstance)
  