anchor.diff:    return new HybridFileSystem(fileSystem);
   }
   
  -train(String scriptUri) {
  +train(String scriptUri, String platformKernel) {
     // TODO(28532): Enable on Windows.
     if (Platform.isWindows) return;
   
  
positive.code: }
  
  main([args]) {
    if (args?.length == 2 && args[0] == '--train') {
      // This entry point is used when creating an app snapshot. The argument
      // provides a script to compile to warm-up generated code.
      train(args[1]);
    } else {
      // Entry point for the Kernel isolate.
      return new RawReceivePort()..handler = _processLoadRequest;
  
negative.code:     tag,
      responsePort.sendPort,
      scriptUri,
      platformKernel,
      false /* incremental */,
      false /* strong */,
      1 /* isolateId chosen randomly */,
  