(gud-tooltip-dereference): Add missing optional argument.

diff --git a/lisp/progmodes/gud.el b/lisp/progmodes/gud.el
index 667b0462a366e2425ea65865f7319cb5ead1c229..b06d95e6b99ab9b9d42cbf574c73cd80c5e4a92d 100644 (file)
--- a/lisp/progmodes/gud.el
+++ b/lisp/progmodes/gud.el
@@ -3372,7 +3372,7 @@ For C this would dereference a pointer expression.")
   "The mouse movement event that led to a tooltip display.
 This event can be examined by forms in GUD-TOOLTIP-DISPLAY.")
 
-(defun gud-tooltip-dereference ()
+(defun gud-tooltip-dereference (&optional arg)
   "Toggle whether tooltips should show `* expr' or `expr'.
 With arg, dereference expr iff arg is positive."
  (interactive "P")