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Date: Fri, 05 Jun 2015 17:16:19 +0300
From: "Eli Zaretskii (eliz AT gnu DOT org)" <djgpp AT delorie DOT com>
Subject: Re: DJGPP v2.05: some thoughts
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> From: Martin Str|mberg <ams AT ludd DOT luth DOT se>
> Date: Fri, 5 Jun 2015 12:29:43 +0000 (UTC)
> 
> But, IIRC, C99 (or even perhaps C89) reserved any symbol starting with E.

Where do you see such language in C99?  I don't see it, and neither do
I see it in C11.  But maybe I'm missing something, it's not like I've
read the entire document top to bottom.

I think you remember this from Posix, not from ANSI C.  Posix indeed
says that including errno.h makes all symbols starting with E followed
by any upper-case letter or digit reserved.  But that's Posix, not
ANSI C.  Even the ANSI C++ standard, which does try to be
Posix-compliant, doesn't seem to make such reservations, AFAICT.