anchor.diff:  
   class RunCommand extends DartdevCommand<int> {
     final ArgParser argParser = ArgParser.allowAnything();
  -
  -  RunCommand({bool verbose = false}) : super('run', '''
  +  final bool verbose;
  +  RunCommand({this.verbose = false}) : super('run', '''
   Run a Dart file.''');
   
     @override
  
positive.code: 
      // Starting in ProcessStartMode.inheritStdio mode means the child process
      // can detect support for ansi chars.
      var process = await Process.start(sdk.dart, args,
          mode: ProcessStartMode.inheritStdio);
      return process.exitCode;
    }
  
negative.code:     // execute [run] below.  Without this, the 'dart help run' reports the
      // command pub with no commands or flags.
      final command = sdk.dart;
      final args = [
        '--help',
        if (verbose) '--verbose',
      ];
  
      log.trace('$command ${args.first}');
  
  