anchor.diff:      ..addOption(_kOptionSdkRoot, help: 'Path to the SDK platform files')
       ..addOption(_kOptionTestFile, help: 'Test file to execute')
       ..addOption(_kOptionDillFile, help: 'Precompiled dill file for test')
  +    ..addOption(_kOptionIcudtl, help: 'Path to the ICU data file')
       ..addFlag(_kOptionCoverage,
         defaultsTo: false,
         negatable: false,
  
positive.code: const String _kOptionSdkRoot = 'sdk-root';
  const String _kOptionTestFile = 'test-file';
  const String _kOptionDillFile = 'dill-file';
  const List<String> _kRequiredOptions = <String>[
    _kOptionPackages,
    _kOptionShell,
  
negative.code:   _kOptionSdkRoot,
    _kOptionTestFile,
    _kOptionDillFile,
    _kOptionIcudtl
  ];
  const String _kOptionCoverage = 'coverage';
  const String _kOptionCoveragePath = 'coverage-path';
  