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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.lang.c
Subject: Re: C vs Haskell for XML parsing
Date: Tue, 29 Aug 2023 22:14:27 -0700
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Keith Thompson <Keith.S.Thompson+u@gmail.com> writes:

> David Brown <david.brown@hesbynett.no> writes:
> [...]
>
>> Being able to accept $ in identifiers is a convenient extension.
>
> Quibble: $ in identifiers is not an extension as specified in section 4
> of the standard.  Starting in C99, the set of characters accepted in
> identifiers is implementation-defined.  (I'm not sure what difference
> that makes.)

In Annex J, J.5.2 gives adding $ to the set of characters that
can appear in identifiers as an example of a common extension.