code: func (l MapLoader) Load(ep *transport.Endpoint) (storer.Storer, error) {
  	s, ok := l[ep.String()]
  	if !ok {
  		return nil, transport.ErrRepositoryNotFound
  	}
  
  	return s, nil
  }
docs: // Load returns a storer.Storer for given a transport.Endpoint by looking it up
  // in the map. Returns transport.ErrRepositoryNotFound if the endpoint does not
  // exist.