Hey folks,
just being a purist :
void f(int arg1, , int arg2);
This is the declaration of a function !!!
void f(int arg1, int arg2)
{
  // my superior implementation  ;-)     (ever seen code with a smile displayed in it)
}
This is the definition, so when asking to see the declaration you should see the first flavour.
Anyone tested where the cursor ends up for a declaration like : 
void function(
   int arg1,
  int arg2);
Cheers,
Lieven