bug#18504: 24.3.93; posn-at-point intermittently returns wrong value for a valid buffer position

[Eli Zaretskii]

> Date: Fri, 19 Sep 2014 21:52:29 +0400
> From: Dmitry Gutov <dgutov@yandex.ru>
> CC: 18504@debbugs.gnu.org
> 
> On 09/19/2014 06:54 PM, Eli Zaretskii wrote:
> 
> > I tried that, but the probability of getting the problem is too low on
> > my system.  I see it maybe once in many hundreds of attempts.
> 
> Have you tried that with the foofoofoo branch?

Of course.

> > So the first thing I'd try to do is print the
> > argument POS you pass to posn-at-point in those cases -- could it be t
> > or some other incorrect/unexpected value?
> 
> Nope. POS is always the same.

I sometimes see nil there.