code: func GetLocalAuth(ctx context.Context) *LocalAuth {
  	ret := LocalAuth{}
  	ok, err := Lookup(ctx, "local_auth", &ret)
  	if err != nil {
  		panic(err)
  	}
  	if !ok {
  		return nil
  	}
  	return &ret
  }
docs: // GetLocalAuth calls Lookup and returns a copy of the current LocalAuth from
  // LUCI_CONTEXT if it was present. If no LocalAuth is in the context, this
  // returns nil.