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From: Eli Zaretskii <eliz@gnu.org>
Newsgroups: gmane.emacs.devel
Subject: Re: EMACS_INT cleanup
Date: Thu, 23 Sep 2010 22:52:00 +0200
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> Date: Thu, 23 Sep 2010 22:46:09 +0200
> From: Eli Zaretskii <eliz@gnu.org>
> Cc: emacs-devel@gnu.org
> 
> Better make it a type that is 64-bit wide on a 64-bit host.  Perhaps
> 
>   #define SPECPDL_INDEX()	((unsigned long) (specpdl_ptr - specpdl))

On second thought, maybe you are right, and casting to int is better.
Perhaps just leave a comment there explaining why.