X-Git-Url: http://git.hcoop.net/bpt/emacs.git/blobdiff_plain/678fb7066698ebfe3aecba722294025ed26da01b..b8657d829a50110930decf87545ca2a19ff991c1:/lisp/calc/calc-misc.el

diff --git a/lisp/calc/calc-misc.el b/lisp/calc/calc-misc.el
index ac1b262160..b21516f5f6 100644
--- a/lisp/calc/calc-misc.el
+++ b/lisp/calc/calc-misc.el
@@ -1,6 +1,6 @@
 ;;; calc-misc.el --- miscellaneous functions for Calc
 
-;; Copyright (C) 1990-1993, 2001-2012 Free Software Foundation, Inc.
+;; Copyright (C) 1990-1993, 2001-2014 Free Software Foundation, Inc.
 
 ;; Author: David Gillespie <daveg@synaptics.com>
 ;; Maintainer: Jay Belanger <jay.p.belanger@gmail.com>
@@ -305,7 +305,8 @@ Calc user interface as before (either C-x * C or C-x * K; initially C-x * C).
 	       (string-match "\\`\\*" (car stuff)))
 	  (setq stuff (cons '* (cons (substring (car stuff) 1)
 				     (cdr stuff)))))))
-  (setq calc-next-why (cons stuff calc-next-why))
+  (unless (member stuff calc-next-why)
+    (setq calc-next-why (cons stuff calc-next-why)))
   nil)
 
 ;; True if A is a constant or vector of constants.  [P x] [Public]