anchor.diff:        negatable: true,
         help: 'Whether to only build summary files.')
     ..addOption('target',
  -      allowed: const ['vm', 'dart2js', 'ddc'],
  -      help: 'Build kernel for the vm, dart2js, or ddc')
  +      allowed: const [
  +        'vm',
  +        'flutter',
  +        'flutter_runner',
  +        'dart2js',
  +        'ddc',
  +      ],
  +      help: 'Build kernel for the vm, flutter, flutter_runner, dart2js or ddc')
     ..addOption('dart-sdk-summary')
     ..addMultiOption('input-summary')
     ..addMultiOption('input-linked')
  
positive.code:       target = new VmTarget(targetFlags);
        if (summaryOnly) {
          out.writeln('error: --summary-only not supported for the vm target');
        }
        break;
      case 'dart2js':
  
negative.code: import 'package:kernel/ast.dart' show Component, Library;
  import 'package:kernel/target/targets.dart';
  import 'package:vm/target/vm.dart';
  import 'package:vm/target/flutter.dart';
  import 'package:vm/target/flutter_runner.dart';
  import 'package:compiler/src/kernel/dart2js_target.dart';
  
  main(List<String> args) async {
  