anchor.diff:      });
     }
   
  -  /// If a class extends a private superclass, find the closest public superclass
  -  /// of the private superclass.
  +  /// If a class extends a private superclass, find the closest public
  +  /// superclass of the private superclass.
     String validSuperclass() {
       if (superclass == null) return 'dart.core.Object';
       if (_isVisible(superclass)) return superclass.qualifiedName;
  
positive.code:       }
      } else {
        var clazz = new Class(classMirror);
  
        if (clazz.isError()) {
          errors[classMirror.simpleName] = clazz;
  
negative.code:       throw new StateError('No library_list.json');
      }
      libraryMap =
          JSON.decode(new File(
              '$_outputDirectory/library_list.json').readAsStringSync());
      libraryMap['libraries'].addAll(filteredEntities
          .where((e) => e is Library)
          .map((e) => e.previewMap));
  