bug#24914: 24.5; isearch-regexp: wrong error message

[Eli Zaretskii]

> From: Noam Postavsky <npostavs@users.sourceforge.net>
> Date: Mon, 04 Dec 2017 01:27:27 -0500
> Cc: 24914@debbugs.gnu.org
> 
> Drew Adams <drew.adams@oracle.com> writes:
> 
> >> It's not a limit in Lisp, but in regex.c.
> >
> > We can't use something larger there?
> 
> Hmm, right, actually I see in regex.h:
> 
>     /* If sizeof(int) == 2, then ((1 << 15) - 1) overflows.  */
>     #define RE_DUP_MAX (0x7fff)
> 
> Does Emacs even support 16 bit platforms?

Emacs never did (the MS-DOS port of Emacs runs in i386 32-bit
protected mode on top of a 16-bit OS).  But regex.c did, at some very
distant past, to support the 16-bit MS compiler, or at least it tried
to.