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

[Stefan Monnier]

> See my other message: I think we are talking about 2 different
> things.  My gripe was only about using the term "destructive
> modification", which muddies the waters without gaining anything.

I don't know, to me "destructive modification" sounds like a very clear
term explaining the general kind of danger we're up against (the kind
that's summarized in Scheme by adding a "!" at the end of the
identifier).


        Stefan