bug#14099: 24.3.50; regression: bad font locking for `abort' in Lisp mode

[Drew Adams]

> > emacs -Q
> > Type this in an Emacs Lisp buffer:
> > (abort-recursive-edit)
> > Emacs now highlights `abort' here, which is bad.
> 
> I can't reproduce this, but maybe I didn't do everything needed for
> reproduction.  What exactly do you mean by "in an Emacs Lisp buffer"?
> How did you create such a buffer, starting from "emacs -Q"?
> 
> What I did was to create a buffer and manually put it under
> emacs-lisp-mode.

The regression was apparently fixed.  It is easy to repro it in the build I
reported on, from 2013-03-23.  But it no longer repros in a build from 3-28.

As for reproducing in 3-23, just put that sexp in *scratch* (Lisp interaction
mode) or any buffer that is `emacs-lisp-mode'.

So you can close this bug (or I will), unless you want to investigate further
for some reason.  I don't know what other changes were made when the regression
was introduced.  This is a pretty basic mistake, so maybe the changes are worth
looking at.

Also, as I mentioned, I found no `abort' function etc. in Emacs, and even with
the latest build (abort) still highlights in red.  What was fixed is that
(abort-recursive-edit) no longer has the `abort' part in red.  But what is this
`abort' function, and why is it highlighted with `font-lock-warning-face'?