how to handle void arguments in generic programming ?

[Timothee Cour]

The code snippet below doesn't work. Is there a way to make it work?

import std.stdio;
void main(){
  writelnIfNonVoid(writeln("ok"));
}
void writelnIfNonVoid(T...)(T a){
  static if(T.length)
    writeln(a);
}
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