bug#7952: 24.0.50; crash in find_interval

[Eli Zaretskii]

> From: Stefan Monnier <monnier@iro.umontreal.ca>
> Cc: Chong Yidong <cyd@stupidchicken.com>,  romain@orebokech.com,  
> 7952@debbugs.gnu.org
> Date: Mon, 09 May 2011 11:06:52 -0300
> 
> BTW, wouldn't it be preferable to pass the `start' position as an
> argument rather passing it implicitly via a dynamic variable?

??? It's a hook we are going to call, right?  It's not just any
function.