anchor.diff:    Future<int> build({
       String assetBase: _kDefaultAssetBase,
       String mainPath: _kDefaultMainPath,
  -    String manifestPath,
  +    String manifestPath: _kDefaultManifestPath,
       String outputPath: _kDefaultOutputPath,
       String snapshotPath: _kDefaultSnapshotPath,
       String privateKeyPath: _kDefaultPrivateKeyPath,
  
positive.code:     argParser.addOption('asset-base', defaultsTo: _kDefaultAssetBase);
      argParser.addOption('compiler');
      argParser.addOption('main', defaultsTo: _kDefaultMainPath);
      argParser.addOption('manifest');
      argParser.addOption('private-key', defaultsTo: _kDefaultPrivateKeyPath);
      argParser.addOption('output-file', abbr: 'o', defaultsTo: _kDefaultOutputPath);
      argParser.addOption('snapshot', defaultsTo: _kDefaultSnapshotPath);
  
negative.code: 
  const String _kDefaultAssetBase = 'packages/material_design_icons/icons';
  const String _kDefaultMainPath = 'lib/main.dart';
  const String _kDefaultManifestPath = 'flutter.yaml';
  const String _kDefaultOutputPath = 'app.flx';
  const String _kDefaultSnapshotPath = 'snapshot_blob.bin';
  const String _kDefaultPrivateKeyPath = 'privatekey.der';
  