Re: Overlay arrow in *compilation* and *grep* buffers

[Richard Stallman]

    > Richard installed a different change to simple.el.
    > 
    > (put 'next-error-overlay-arrow-position 'overlay-arrow-string "")
    > 
    > but this is a *different* arrow that displays in the *source* buffer.
    > 
    > I think this change is wrong.

    Which change is wrong--Richard's or mine?

It looks like I changed the wrong marker, and indeed it appears not to
work.  If your change does the job, please delete mine.