code: func routesFromSnapshot(cfgSnap *proxycfg.ConfigSnapshot, token string) ([]proto.Message, error) {
  	if cfgSnap == nil {
  		return nil, errors.New("nil config given")
  	}
  	// We don't support routes yet but probably will later
  	return nil, nil
  }
docs: // routesFromSnapshot returns the xDS API representation of the "routes"
  // in the snapshot.