Named out parameters. How to call them?

myfunc:

Code (csharp):

1.  
2. void myfunc(string s, out int x){
3.    Debug.Log(s);
4.    x = 123;
5. }
6.  

Calling myfunc:

Code (csharp):

1.  
2. int i;
3. myfunc(s: "abc",x: out i);
4.  

Calling myfunc:

Code (csharp):

1.  
2. int i;
3. myfunc(s: "abc",out x: i);
4.  

I can't find the right syntax.

How do I call a function using named arguments, with an optional parameter?

 

'out' does not specify an optional parameter, but an output parameter.

In any case, naming output prameters doesn't seem to be possible in the version of .net Unity uses. The correct syntax would be 'x: out i'. But named variables are only useful for optional parameters really (apart from readability). VS/Resharper complains to me that the name identifier is redundant.