anchor.diff:        await server.start(
             clientId: 'dart $name',
             clientVersion: _dartSdkVersion,
  -          enableAsserts: enableAsserts,
             instrumentationLogFile: instrumentationLogFile,
  -          profileServer: profileServer,
  -          serverPath: serverPath,
  -          servicesPort: servicesPort,
             sdkPath: sdkPath);
         _ServerNotifications serverNotifications = _ServerNotifications(server);
         await serverNotifications.listenToServer(server);
  
positive.code: import 'package:analysis_server_client/handler/notification_handler.dart';
  import 'package:analysis_server_client/listener/server_listener.dart';
  import 'package:analysis_server_client/protocol.dart';
  import 'package:analysis_server_client/server.dart';
  import 'package:args/command_runner.dart';
  import 'package:cli_util/cli_logging.dart';
  import 'package:nnbd_migration/src/messages.dart';
  
negative.code: 
      Map<String, List<AnalysisError>> fileErrors = {};
  
      String instrumentationLogFile;
      String sdkPath = options.sdkPath;
      bool stdioPassthrough = false;
  
      if (options.debug) {
        stdioPassthrough = true;
        instrumentationLogFile = path.join(
            Directory.systemTemp.createTempSync('migration_debug').path,
  