code: func Drivers() []string {
  	driversMu.RLock()
  	defer driversMu.RUnlock()
  	var list []string
  	for name := range drivers {
  		list = append(list, name)
  	}
  	sort.Strings(list)
  	return list
  }
docs: // Drivers returns a sorted list of the names of the registered drivers.