anchor.diff:      tag,
       responsePort.sendPort,
       scriptUri,
  -    null /* platformKernel */,
  +    platformKernel,
       false /* incremental */,
       false /* strong */,
       1 /* isolateId chosen randomly */,
  
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:   return new HybridFileSystem(fileSystem);
  }
  
  train(String scriptUri, String platformKernel) {
    // TODO(28532): Enable on Windows.
    if (Platform.isWindows) return;
  
  