tensorflow::Tensor tensor(list->element_dtype,
                                tensorflow::TensorShape(result_shape));
      auto attr_or = tensorflow::ConvertTensor(tensor, &rewriter);
      if (!attr_or.ok()) return failure();
      rewriter.replaceOpWithNewOp<TF::ConstOp>(op, attr_or.value());
      return success();
    }

    // Extract individual tensor list element and combine them using the tf.Pack
    // op.

	claims[ldapUser] = ldapUserDN
	claims[ldapActualUser] = ldapActualUserDN
	claims[ldapUserN] = ldapUsername
	// Add lookup up LDAP attributes as claims.
	for attrib, value := range lookupResult.Attributes {
		claims[ldapAttribPrefix+attrib] = value
	}

	secret, err := getTokenSigningKey()
	if err != nil {
		writeSTSErrorResponse(ctx, w, ErrSTSInternalError, err)
		return
	}