Failed to parse explicit vararg declaration without other parameters

[kant2002]

void console_read(...);

Exception

typeof(Cesium.Core.ParseException): expected { while parsing compound_statement
expected ; while parsing ;
 but got OpenParen: (

[ForNeVeR]

Is it actually allowed, though? To me, the section 6.7.6 Declarators of the standard looks like it disallows single ... in the parameter list.

gcc 12.2 from godbolt.org confirms this:

<source>:3:10: error: ISO C requires a named argument before '...'
    3 | void foo(...);

[ForNeVeR]

I think we could add much better error reporting for this case, but we shouldn't actually compile this code.