anchor.diff:        print('[sass_transformer] processing: ${id}');
   
         //TODO: add support for no-symlinks packages
  -      options.includePaths.add(dirname(id.path).replaceFirst('lib', 'packages/${id.package}'));
  +      options.includePaths
  +          .add(dirname(id.path).replaceFirst('lib', 'packages/${id.package}'));
         if (mode == BarbackMode.DEBUG)
           print('[sass_transformer] includePaths: ${options.includePaths}');
         try {
           var output = await (new Sass()
  -                ..scss = id.extension == '.scss'
  -                ..loadPath = options.includePaths
  -                ..executable = options.executable
  -              ).transform(content);
  +              ..scss = id.extension == '.scss'
  +              ..loadPath = options.includePaths
  +              ..executable = options.executable
  +              ..compass = options.compass)
  +            .transform(content);
           var newId = id.changeExtension('.css');
           transform.addOutput(new Asset.fromString(newId, output));
           // (this is to no output scss files in build folder)
  
positive.code:       }
      }));
    }
  }
negative.code: import 'package:path/path.dart';
  import 'sass.dart';
  import 'src/transformer_options.dart';
  
  /// Transformer used by `pub build` and `pub serve` to convert Sass-files to CSS.
  class SassTransformer extends AggregateTransformer {
  