anchor.diff:      }
     });
   
  +  // https://docs.microsoft.com/en-us/windows-hardware/drivers/install/overview-of-device-interface-classes
     using((Arena arena) {
       final interfaceGuid = calloc<GUID>()..ref.setGUID(GUID_DEVINTERFACE_HID);
   
  
positive.code:       final interfacePaths =
            _iterateInterfacePath(deviceInfoSetPtr, interfaceGuid);
        for (final path in interfacePaths) {
          print('hid interface ${path.length}'); // utf8.decode(path)
        }
      } finally {
        SetupDiDestroyDeviceInfoList(deviceInfoSetPtr);
  
negative.code: const GUID_DEVINTERFACE_HID = '{4D1E55B2-F16F-11CF-88CB-001111000030}';
  
  void main() {
    // https://docs.microsoft.com/en-us/windows-hardware/drivers/install/overview-of-device-setup-classes
    using((Arena arena) {
      final deviceGuid = arena<GUID>()..ref.setGUID(GUID_DEVCLASS_NET);
  
  