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Common Lisp implementation running on the JVM

There is a newer version: 1.9.2

;;; copy-symbol.lisp
;;;
;;; Copyright (C) 2003-2005 Peter Graves
;;; $Id$
;;;
;;; This program is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU General Public License
;;; as published by the Free Software Foundation; either version 2
;;; of the License, or (at your option) any later version.
;;;
;;; This program 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 General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
;;;
;;; As a special exception, the copyright holders of this library give you
;;; permission to link this library with independent modules to produce an
;;; executable, regardless of the license terms of these independent
;;; modules, and to copy and distribute the resulting executable under
;;; terms of your choice, provided that you also meet, for each linked
;;; independent module, the terms and conditions of the license of that
;;; module.  An independent module is a module which is not derived from
;;; or based on this library.  If you modify this library, you may extend
;;; this exception to your version of the library, but you are not
;;; obligated to do so.  If you do not wish to do so, delete this
;;; exception statement from your version.

(in-package #:system)

;;; From CMUCL.

(defun copy-symbol (symbol &optional (copy-props nil) &aux new-symbol)
  (declare (type symbol symbol))
  (setq new-symbol (make-symbol (symbol-name symbol)))
  (when copy-props
    (when (boundp symbol)
      (set new-symbol (symbol-value symbol)))
    (setf (symbol-plist new-symbol) (copy-list (symbol-plist symbol)))
    (when (fboundp symbol)
      (setf (symbol-function new-symbol) (symbol-function symbol))))
  new-symbol)