Re: "A diagram of C23 basic types"

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.

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.

For example

void bar(int);
void foo(void) {
  bar(1,);
}

MSVC:
comma.c(3): error C2059: syntax error: ')'

clang:
comma.c:3:9: error: expected expression
    3 |   bar(1,);
      |         ^

gcc:
comma.c: In function 'foo':
comma.c:3:9: error: expected expression before ')' token
    3 |   bar(1,);
      |         ^
comma.c:3:3: error: too many arguments to function 'bar'
    3 |   bar(1,);
      |   ^~~
comma.c:1:6: note: declared here
    1 | void bar(int);
      |      ^~~

But is it (rejection) really required by the Standard? I don't know.