How to use the private/co.println function in private

Co.fs.stat(__filename, function(err, stat2) {
    Co.println("stat2");
    fire();
  });

timer = setTimeout(function() {
    Co.println('unloop');
    fire();
  });

Co.fs.stat(__filename, function(err, stat) {
  Co.println("stat1");

  var looped = false;
  var unlooped = false;
  var timer ;
  
  function fire() {
    unlooped = true;
    if (looped) {
      looped = false;
      loop.unloop();
    }
    
    if (timer) {
      clearTimeout(timer);
      timer = null;
    }