anchor.diff:  
   library analyzer_cli.src.bootloader;
   
  +import 'dart:async';
   import 'dart:isolate';
   
   import 'package:analyzer/file_system/physical_file_system.dart';
  
positive.code:   /// Loading an image consists in assembling an analyzer `main()`, configured
    /// to include the appropriate analyzer plugins as specified in
    /// `.analyzer_options` which is then run in a spawned isolate.
    void load() {
      List<PluginInfo> plugins = _validate(config.plugins);
      String mainSource = new Assembler(plugins).createMain();
  
      Uri uri =
          Uri.parse('data:application/dart;charset=utf-8,${Uri.encodeComponent(
  
negative.code:         packageRootPath != null ? packageRootPath : './packages';
      Uri packageUri = new Uri.file(packageRoot);
  
      Isolate.spawnUri(uri, args, null /* msg */,
          packageRoot: packageUri, onExit: exitListener.sendPort);
  
      return completer.future;
    }
  }
  