anchor.diff:      }
     }
   
  -  var sources = parsedArgs['source'].map(Uri.parse).toList();
     var summary = await fe.compile(state, sources, onProblem);
   
     if (summary != null) {
  
positive.code: /// An [ArgParser] for generating kernel summaries.
  final summaryArgsParser = new ArgParser()
    ..addFlag('help', negatable: false)
    ..addOption('dart-sdk-summary')
    ..addOption('input-summary', allowMultiple: true)
    ..addOption('multi-root', allowMultiple: true)
  
negative.code: import 'package:bazel_worker/bazel_worker.dart';
  import 'package:front_end/src/api_unstable/summary_worker.dart' as fe;
  import 'package:front_end/src/multi_root_file_system.dart';
  import 'package:kernel/ast.dart' show Program, Library;
  import 'package:kernel/target/targets.dart';
  
  main(List<String> args) async {
  