On 7 Nov 2015 6:11 pm, "Eli Zaretskii" <eliz@gnu.org> wrote:
>
> > Date: Sat, 7 Nov 2015 18:03:52 +0000
> > From: Artur Malabarba <bruce.connor.am@gmail.com>
> > Cc: Lee B <lboc.home@gmail.com>, 21828@debbugs.gnu.org
> >
> > > (This bug was there ever since we rewrote abbrev.c in Lisp 8 years
> > > ago.)
> >
> > Oh, the beauty of writing tests.
> > Is that a sign that this function isn't really used at all and might
> > as well be marked as obsolete? :-D
>
> It is not used in Emacs.  But the OP evidently needed it, so making it
> obsolete is premature, I think.

Actually, the OP spotted this while writing tests for abbrev.el.
And the fact that no-one reported this for 8 years is at least a mild indication that nobody's using it. :-)