The compiler accepts a dangling comma in a comma separated list of actual
parameters.
What is the type of this missing actual parameter?

-manfred

On Wednesday, 9 October 2013 at 12:33:07 UTC, Manfred Nowak wrote:
> The compiler accepts a dangling comma in a comma separated list of actual
> parameters.
> What is the type of this missing actual parameter?
>
> -manfred

There is no missing parameter. It is just a convenience syntax to avoid copy-paste mistakes. Those two are equivalent:

```
void foo( int, double, string, );
```
vs
```
void foo( int, double, string );
```

Dicebot wrote:

> Those two are equivalent:

Maybe right for functions, but is currently wrong for templated functions
  `this( T ...)( T param)'
I got a "Range violation" on accessing the last parameter of `param'.

Maybe the parameters are wongly counted?

-manfred

On 10/9/13, Manfred Nowak <svv1999@hotmail.com> wrote:
> Maybe the parameters are wongly counted?

I doubt it. Do you have a test-case?

Works for me: http://dpaste.dzfl.pl/86d226b1

Andrej Mitrovic wrote:

> Do you have a test-case?

On reducing the case it turned out, that the error message blaimed the wrong file for a really existing "Range violation". By pure chance the lines in the wrongly given file were these:

      AST[] astStar= visit( data.ast[0]);
      foreach( elem; data.ast[ 1 .. $])
        astStar~= visit( elem);
      // <-- erroneous line

--- and the second parameter was missing, but the `,' was introduced by 
another bug.

I will file a bug report on "error message gives wrong filename".

-manfred

Manfred Nowak wrote:

> I will file a bug report

Done:
http://d.puremagic.com/issues/show_bug.cgi?id=11209

-manfred