code: func fatal(msg string) {
  	// add newline if needed
  	if !strings.HasSuffix(msg, "\n") {
  		msg += "\n"
  	}
  
  	if glog.V(2) {
  		glog.FatalDepth(2, msg)
  	}
  	fmt.Fprint(os.Stderr, msg)
  	os.Exit(1)
  }
docs: // fatal prints the message and then exits. If V(2) or greater, glog.Fatal
  // is invoked for extended information.