anchor.diff:    final Uri uri;
   
     /**
  -   * The absolute file URI of the file.
  -   */
  -  final Uri fileUri;
  -
  -  /**
      * The [Source] of the file with the [uri].
      */
     final Source source;
  
positive.code:     _pathToCanonicalFile.clear();
      _partToLibraries.clear();
      _subtypedNameToFiles.clear();
    }
  
    /**
     * A specialized version of package:path context.toUri(). This assumes the
     * path is absolute as does a performant conversion to a file: uri.
     */
    Uri _absolutePathToFileUri(String path) {
      if (path.contains(r'\')) {
        return new Uri(scheme: 'file', path: path.replaceAll(r'\', '/'));
      } else {
        return new Uri(scheme: 'file', path: path);
      }
    }
  
    void _addFileWithPath(String path, FileState file) {
  
negative.code:    */
    FileState get unresolvedFile {
      if (_unresolvedFile == null) {
        _unresolvedFile = new FileState._(this, null, null, null);
        _unresolvedFile.refresh();
      }
      return _unresolvedFile;
  