; Comments.

[gnu-emacs] / lisp / calc / calc-misc.el

diff --git a/lisp/calc/calc-misc.el b/lisp/calc/calc-misc.el
index ac1b2621605c89ebdc983aba557c1696e616992f..9c5d7184149e45a215cb77a1bd21c48f4fe3cf28 100644 (file)
--- 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, 2001-2015 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]