mlir::StringAttr device = op->getAttrOfType<mlir::StringAttr>(kDeviceAttr);
  if (!device || device.getValue().empty()) {
    return std::nullopt;
  }
  tensorflow::DeviceNameUtils::ParsedName parsed_name;
  if (!tensorflow::DeviceNameUtils::ParseFullName(device.str(), &parsed_name)) {
    return std::nullopt;
  }
  if (!parsed_name.has_type) {
    return std::nullopt;
  }
  return parsed_name.type;
}

	}

	pattern := event.NewPattern(prefix, suffix)

	var eventNames []event.Name
	var mask pubsub.Mask
	for _, s := range values[peerRESTListenEvents] {
		eventName, err := event.ParseName(s)
		if err != nil {
			writeErrorResponse(ctx, w, toAPIError(ctx, err), r.URL)
			return
		}
		mask.MergeMaskable(eventName)
		eventNames = append(eventNames, eventName)
	}

	if bucketName != "" {

		}
		if err := w.WriteEvent(ev); err != nil {
			t.Fatalf("failed to write out test %s: %v", testPath, err)
		}
	}

	// Parse the test trace.
	parsed, err := parseTrace(&trace, int64(trace.Len()))
	if err != nil {
		t.Fatalf("failed to parse trace: %v", err)
	}
	return parsed