If I run this code
```d
import std.stdio;
void main(){
auto next = Counter(10);
next().writeln;
next().writeln;
next().writeln;
// What is "next" function?
writeln( "'next' is ", next );
// What is "Counter" function? This fails
// writeln( "'Counter' is ", Counter );
}
auto Counter(int nextValue) => () => nextValue++;
```
Executing this code results in:
```
10
11
12
'next' is int delegate() pure nothrow @nogc @safe
```
Now, I uncomment the ```writeln( "'Counter' is ", Counter );```
line and compiler says
```
/home/antonio/Devel/topbrokers/whatsapp-srv/admin/x.d(12): Error:
function `x.Counter(int nextValue)` is not callable using
argument types `()`
/home/antonio/Devel/topbrokers/whatsapp-srv/admin/x.d(12):
too few arguments, expected 1, got 0
```
I understand the problem with UFCS (``next`` is not using UFCS
because it is a delegate defined in the own main() function, and
``Counter``` without () is treated as a function call because it
is UFCS eligible )
- What is the way to do ```writeln``` work with ```Counter```
function the same way it works with ```next``` function?
