code: func MakeToken(eid *dm.Execution_ID) distributor.Token {
  	return distributor.Token(fmt.Sprintf("fakeDistributor:%s|%d|%d", eid.Quest,
  		eid.Attempt, eid.Id))
  }
docs: // MakeToken makes a distributor Token out of an Execution_ID. In this
  // implementation of a Distributor there's a 1:1 mapping between Execution_ID
  // and distributor task. This is not always the case for real distributor
  // implementations.