anchor.diff:        throw new StateError(
             "unexpected args, expected only --persistent-worker but got: $args");
       }
  -    await new KernelWorker().run();
  +    await new KernelWorker(sendPort: sendPort).run();
     } else {
       var result = await computeKernel(args);
       if (!result.succeeded) {
  
positive.code: /// A bazel worker loop that can compute full or summary kernel files.
  class KernelWorker extends AsyncWorkerLoop {
    fe.InitializedCompilerState previousState;
  
    Future<WorkResponse> performRequest(WorkRequest request) async {
      var outputBuffer = new StringBuffer();
  
negative.code: 
  import 'dart:async';
  import 'dart:io';
  import 'dart:isolate';
  
  import 'package:args/args.dart';
  import 'package:bazel_worker/bazel_worker.dart';
  