anchor.diff:    if (command == null) {
       print(red.wrap("Specify a command: ${parser.commands.keys.join(', ')}"));
       print('');
  -    _printUsage(parser);
  +    _printUsage();
       exitCode = ExitCode.usage.code;
       return;
     }
  
positive.code: import 'dart:convert';
  import 'dart:io';
  
  import 'package:args/args.dart';
  import 'package:io/io.dart';
  import 'package:io/ansi.dart';
  import 'package:path/path.dart' as p;
  
negative.code:   } on FormatException catch (e) {
      print(red.wrap(e.message));
      print('');
      _printUsage();
      exitCode = ExitCode.usage.code;
      return;
    }
  
    if (options.help) {
      _printUsage();
      return;
    }
  
  