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From: Keith Thompson <Keith.S.Thompson+u@gmail.com>
Newsgroups: comp.lang.c
Subject: Re: "A diagram of C23 basic types"
Date: Wed, 09 Apr 2025 14:56:47 -0700
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David Brown <david.brown@hesbynett.no> writes:
> On 09/04/2025 11:49, Michael S wrote:
[...]
>> 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 :
[...]

Yes, but also no.

A trailing comma in an argument list in a function call is a syntax
error, but the standard doesn't require syntax errors (or constraint
violations) to be fatal.  Rejection is required only for #error.

In most cases, most compilers do treat syntax errors as fatal, but for
example a compiler that accepts trailing commas as an extension might
produce a non-fatal warning even in conforming mode.

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