anchor.diff: +import 'dart:convert';
   import 'dart:ffi';
   import 'dart:typed_data';
   
  
positive.code:     }
    });
  
    using((Arena arena) {
      final interfaceGuid = calloc<GUID>()..ref.setGUID(GUID_DEVINTERFACE_HID);
  
  
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);
  
  