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From: David Brown <david.brown@hesbynett.no>
Newsgroups: comp.lang.c
Subject: Re: "A diagram of C23 basic types"
Date: Wed, 9 Apr 2025 15:01:24 +0200
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On 09/04/2025 11:49, Michael S wrote:
> On Fri, 4 Apr 2025 02:57:10 -0000 (UTC)
> Lawrence D'Oliveiro <ldo@nz.invalid> wrote:
> 
>> On Thu, 3 Apr 2025 21:48:40 +0100, bart wrote:
>>
>>> Commas are overwhelmingly used to separate list elements in
>>> programming languages.
>>
>> Not just separate, but terminate.
> 
> I disagree. I am in favor of optional trailing commas rather than
> mandatory ones.

I am certainly in favour of them for things like initialiser lists and 
enum declarations.

> 
>> All the reasonable languages allow
>> trailing commas.
> 
> Are your sure that C Standard does not allow trailing commas?
> That is, they are obviously legal in initializer lists.
> All compilers that I tried reject trailing comma in function calls.
> 
....
> But is it (rejection) really required by the Standard? I don't know.
> 
> 

Yes.  The syntax (in 6.5.2p1) is :

postfix-expression:
	...
	postfix-expression ( argument-expression-list opt )
	...

argument-expression-list :
	argument-expression
	argument-expression-list , argument-expression



I don't think it is unreasonable to suggest that it might be nice to 
allow a trailing comma, at least in variadic function calls, but the 
syntax of C does not allow it.