anchor.diff:        library.fileUri = fileUri;
       }
   
  -    debugPath.add(library.name ?? library.importUri?.toString() ?? 'library');
  +    assert(((_) => true)(debugPath
  +        .add(library.name ?? library.importUri?.toString() ?? 'library')));
   
       if (shouldWriteData) {
         _fillTreeNodeList(
  
positive.code:     }
      variableStack.length = 0;
      var transformerFlags = getAndResetTransformerFlags();
      debugPath.removeLast();
      if (shouldWriteData) {
        node.fileOffset = fileOffset;
        node.fileEndOffset = fileEndOffset;
  
negative.code:     }, library);
      _byteOffset = procedureOffsets.last;
  
      assert(((_) => true)(debugPath.removeLast()));
      _currentLibrary = null;
      return library;
    }
  