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diff --git a/third_party/lisp/sclf/serial.lisp b/third_party/lisp/sclf/serial.lisp
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+ ;;; serial.lisp --- serialisation of CLOS objects
+
+ ;;; Copyright (C) 2009 by Walter C. Pelissero
+
+ ;;; Author: Walter C. Pelissero <walter@pelissero.de>
+ ;;; Project: sclf
+
+#+cmu (ext:file-comment "$Module: serial.lisp $")
+
+;;; This library is free software; you can redistribute it and/or
+;;; modify it under the terms of the GNU Lesser General Public License
+;;; as published by the Free Software Foundation; either version 2.1
+;;; of the License, or (at your option) any later version.
+;;; This library is distributed in the hope that it will be useful,
+;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;; Lesser General Public License for more details.
+;;; You should have received a copy of the GNU Lesser General Public
+;;; License along with this library; if not, write to the Free
+;;; Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+;;; 02111-1307 USA
+
+(in-package :sclf)
+
+(defclass printable-object-mixin () ())
+
+(defmacro reconstruct-object (class &rest args)
+  `(apply #'make-instance ',class ',args))
+
+(defun print-readable-instance (object &optional stream)
+  (unless stream
+    (setf stream *standard-output*))
+  (be class (class-of object)
+    (pprint-logical-block (stream (copy-list (class-slots class)) :prefix "#.(" :suffix ")")
+      (flet ((spc ()
+               (write-char #\space stream)))
+        (write 'reconstruct-object :stream stream)
+        (spc)
+        (write (class-name class) :stream stream :escape t :readably t :pretty t)
+        (pprint-exit-if-list-exhausted)
+        (spc)
+        (loop
+           (be* slot (pprint-pop)
+                slot-name (slot-definition-name slot)
+                initarg (car (slot-definition-initargs slot))
+             (when (and initarg
+                        (slot-boundp object slot-name))
+               (write initarg :stream stream)
+               (spc)
+               (when *print-pretty*
+                 (pprint-newline :miser stream))
+               (write (slot-value object slot-name)
+                      :stream stream)
+               (pprint-exit-if-list-exhausted)
+               (if *print-pretty*
+                   (pprint-newline :linear stream)
+                   (spc)))))))))
+
+(defmethod print-object ((object printable-object-mixin) stream)
+  (if *print-readably*
+      (print-readable-instance object stream)
+      (call-next-method)))