-------- Original Message -------- Subject: Re: [Q21.4] XEmacs crashes and patch Date: Wed, 02 Jan 2013 16:10:54 -0500 From: steven Mitchell <smitchel(a)bnin.net&gt; To: Vin Shelton <acs(a)alumni.princeton.edu&gt; On 01/02/2013 01:08 PM, Vin Shelton wrote: This was slightly wrong; the corruption occurs when you try to add an item to a menu with a nil value. Try: (progn (add-submenu '("Test Toplevel") '("Test Parent" :included nil ["1" (insert "1")])) (add-submenu '("Test Toplevel" "Test Parent") '("Test Child" ["1" (insert "1")])) (assoc "Test Toplevel" current-menubar)) The second add-submenu will corrupt the menu structure. (Note that the second menu is added right before the nil, instead of at the end of the first menu.) This will trigger a crash the next time the menus are accessed. Note that this is a fairly useless construction; I only found the bug by forgetting to quote my :included predicate (which returned nil at insertion-time.) It isn't a big deal to normal running, but really impedes debugging errors like that. (Restarting XEmacs gets old fast!) Best, Byrel Mitchell _______________________________________________ XEmacs-Beta mailing list XEmacs-Beta(a)xemacs.org http://lists.xemacs.org/mailman/listinfo/xemacs-beta