code: func (r *Robots) Start(args ...interface{}) (err error) {
  	autoRun := true
  	if args[0] != nil {
  		autoRun = args[0].(bool)
  	}
  	for _, robot := range *r {
  		if rerr := robot.Start(autoRun); rerr != nil {
  			err = multierror.Append(err, rerr)
  			return
  		}
  	}
  	return
  }
docs: // Start calls the Start method of each Robot in the collection