Re: C vs Haskell for XML parsing

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From	Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups	comp.lang.c
Subject	Re: C vs Haskell for XML parsing
Date	Sun, 03 Sep 2023 03:55:48 -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.)

On further thought, there is a significant difference.

An implementation that supports $ in identifiers via an via the
"other implementation-defined characters" wording in the syntax
of an identifier can accept foo$bar as an identifier without
issuing a diagnostic.  If it's an extension as defined in section 4
(Conformance) of the standard, it can accept foo$bar but it must
still issue a diagnostic (presumably a non-fatal warning).

(That's in conforming mode, of course.  The standard has nothing to say
about non-conforming modes.)

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Will write code for food.
void Void(void) { Void(); } /* The recursive call of the void */

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Re: C vs Haskell for XML parsing Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2023-09-03 03:55 -0700
  Re: C vs Haskell for XML parsing Tim Rentsch <tr.17687@z991.linuxsc.com> - 2023-09-03 11:44 -0700
    Re: C vs Haskell for XML parsing Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2023-09-03 16:20 -0700
      Re: C vs Haskell for XML parsing Tim Rentsch <tr.17687@z991.linuxsc.com> - 2023-09-03 16:47 -0700
        Re: C vs Haskell for XML parsing Richard Damon <Richard@Damon-Family.org> - 2023-09-03 17:24 -0700
        Re: C vs Haskell for XML parsing Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2023-09-03 17:26 -0700

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