code: func getErrorFromTPUOp(op *tpuapi.Operation) error {
  	if op != nil && op.Error != nil {
  		return &googleapi.Error{
  			Code:    op.ServerResponse.HTTPStatusCode,
  			Message: op.Error.Message,
  		}
  	}
  	return nil
  }
docs: // getErrorFromTPUOp returns the error in the failed op, or nil if the op
  // succeed.