How to specify which parameters a function that is received as an argument should receive?

[Marcone via Digitalmars-d-learn]

How to specify which parameters a function that is received as an 
argument should receive?

Example:
import std;

void myfun(int n){
    writeln(n);
}


void test(lazy void delegate() fun) // how specify that "fun" may 
receive int ?
{
    fun(int);
}

test({myfun;});