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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: Unicode in C Sources
Date: Wed, 19 Feb 2020 12:30:01 -0800
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James Kuyper <jameskuyper@alumni.caltech.edu> writes:

> No, it seems clear to me that "extended identifier" refers to
> identifiers containing members of the extended character set - NOT
> UCNs.

That is highly unlikely.  Extended characters in identifiers are not
required in any implementation, and what's more, implementations
have always been allowed to use extended characters in identifiers,
because in C89/C90 any character (outside of a string constant, etc)
not in the basic character set implies undefined behavior.  There is
no point in calling something out as an addition if nothing has been
added.  What C99 added, with the syntax for identifiers requiring
UCNs to be supported, is a way of using characters outside the basic
character set in a way that is /guaranteed to be portable/.  It is
thus much more likely that the phrase "extended identifiers" used in
the Standard refers to UCNs in idenfiers, not extended characters.