[Emacs-diffs] trunk r116227: * subr.el (butlast): Document what an omitted N means.

[Lars Ingebrigtsen]

------------------------------------------------------------
revno: 116227
revision-id: address@hidden
parent: address@hidden
fixes bug: http://debbugs.gnu.org/13437
committer: Lars Ingebrigtsen <address@hidden>
branch nick: trunk
timestamp: Fri 2014-01-31 23:54:29 -0800
message:
  * subr.el (butlast): Document what an omitted N means.
  
  * subr.el (butlast): Document what an omitted N means.
  (nbutlast): Ditto.
modified:
  lisp/subr.el                   subr.el-20091113204419-o5vbwnq5f7feedwu-151

=== modified file 'lisp/subr.el'
--- a/lisp/subr.el      2014-01-24 04:11:48 +0000
+++ b/lisp/subr.el      2014-02-01 07:54:29 +0000
@@ -364,12 +364,15 @@
          (nthcdr (1- (safe-length list)) list))))
 
 (defun butlast (list &optional n)
-  "Return a copy of LIST with the last N elements removed."
+  "Return a copy of LIST with the last N elements removed.
+If N is omitted or nil, the last element is removed from the
+copy."
   (if (and n (<= n 0)) list
     (nbutlast (copy-sequence list) n)))
 
 (defun nbutlast (list &optional n)
-  "Modifies LIST to remove the last N elements."
+  "Modifies LIST to remove the last N elements.
+If N is omitted or nil, remove the last element."
   (let ((m (length list)))
     (or n (setq n 1))
     (and (< n m)