anchor.diff:        _uriToSourceMap[dartUri] = source;
       }
       return source;
  -  }
  -
  -  /**
  -   * Return info for debugging https://github.com/dart-lang/sdk/issues/35226.
  -   */
  -  Map<String, Object> debugInfo() {
  -    return <String, Object>{
  -      'runtimeType': '$runtimeType',
  -      'libraryMap': libraryMap.debugInfo(),
  -    };
     }
   
     String _getPath(File file) {
  
positive.code:     });
    }
  
    @override
    Source fromFileUri(Uri uri) {
      File file =
  
negative.code:     yield libraryDirectory
          .getChildAssumingFolder(_INTERNAL_DIR)
          .getChildAssumingFile(_LIBRARIES_FILE);
    }
  
    /**
     * Return info for debugging https://github.com/dart-lang/sdk/issues/35226.
     */
    @override
    Map<String, Object> debugInfo() {
      var result = super.debugInfo();
      result['directory'] = _sdkDirectory.path;
      return result;
    }
  
    @override
  