bug#12314: 24.2.50; `add-to-history': use `setq' with `delete'

[Eli Zaretskii]

> From: Andreas Schwab <schwab@linux-m68k.org>
> Cc: Drew Adams <drew.adams@oracle.com>,  12314@debbugs.gnu.org,  cyd@gnu.org
> Date: Sat, 08 Sep 2012 18:19:58 +0200
> 
> Eli Zaretskii <eliz@gnu.org> writes:
> 
> > Then the manual should be corrected to state that much more explicitly
> > than it does now.  Perhaps it shouldn't even talk about destructive
> > removal, as that will surely spread confusion.  For me "destructive"
> > means "in-place", and no amount of describing how 'delete' works
> > internally will ever be able to countermand that.
> 
> Even if the element is not the first one, you always have to think about
> other references that may exist to the cons that is removed.

Sorry, I'm not sure how this is related.  Please elaborate.