(copy-list): Moved back from subr.el.

1 files changed, 9 insertions, 0 deletions

diff --git a/lisp/emacs-lisp/cl.el b/lisp/emacs-lisp/cl.el
index def4d24188..c5d3ef0832 100644
--- a/lisp/emacs-lisp/cl.el
+++ b/lisp/emacs-lisp/cl.el
@@ -514,6 +514,15 @@ Thus, `(list* A B C D)' is equivalent to `(nconc (list A B C) D)', or to
       (push (pop list) res))
     (nreverse res)))
 
+(defun copy-list (list)
+  "Return a copy of a list, which may be a dotted list.
+The elements of the list are not copied, just the list structure itself."
+  (if (consp list)
+      (let ((res nil))
+	(while (consp list) (push (pop list) res))
+	(prog1 (nreverse res) (setcdr res list)))
+    (car list)))
+
 (defun cl-maclisp-member (item list)
   (while (and list (not (equal item (car list)))) (setq list (cdr list)))
   list)