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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: Word For Today: =?utf-8?Q?=E2=80=9CUglification=E2=80=9D?=
Date: Tue, 18 Jun 2024 23:09:00 -0700
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Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:

> Any library from outside the implementation cannot use reserved
> identifiers without invoking undefined behavior, [...]

Reserved identifiers can be used.  It is only declaring or
defining reserved identifiers (in some contexts) that the C
standard calls out as undefined behavior, not other uses.