code: func (a *ActivateExecutionReq) Normalize() error {
  	if err := a.Auth.Normalize(); err != nil {
  		return err
  	}
  	if len(a.ExecutionToken) < MinimumActivationTokenLength {
  		return fmt.Errorf("insufficiently long ExecutionToken: %d",
  			len(a.ExecutionToken))
  	}
  	return nil
  }
docs: // Normalize returns an error iff the ActivateExecutionReq has bad form (nils,
  // insufficient activation token length, etc.