code: def __init__(self, children: Sequence[Doc]):
      self.children = list(children)
      assert all(
          isinstance(doc, Doc) for doc in self.children
      ), self.children
  
imports: from __future__ import annotations
  import abc
  from collections.abc import Sequence
  import enum
  from functools import partial
  import sys
  from typing import NamedTuple
  from jax._src import config
label_desc: Use image node_id 1 to create a new _ConcatDoc object from inherited base classes: Doc with example: obj = _ConcatDoc(children)