anchor.diff:    final String description = 'Create a Flutter app.';
   
     BuildCommand() {
  +    argParser.addFlag('precompiled', negatable: false);
       argParser.addOption('asset-base', defaultsTo: _kDefaultAssetBase);
  -
       argParser.addOption('compiler');
       argParser.addOption('main', defaultsTo: _kDefaultMainPath);
       argParser.addOption('manifest');
  
positive.code: 
      Archive archive = new Archive();
  
      int result = await toolchain.compiler.compile(mainPath: mainPath, snapshotPath: snapshotPath);
      if (result != 0)
        return result;
  
      archive.addFile(_createSnapshotFile(snapshotPath));
  
      for (_Asset asset in assets)
        archive.addFile(_createFile(asset.key, asset.base));
  
negative.code:       manifestPath: argResults['manifest'],
        outputPath: argResults['output-file'],
        snapshotPath: argResults['snapshot'],
        privateKeyPath: argResults['private-key'],
        precompiledSnapshot: argResults['precompiled']
      );
    }
  
  