code: def join(self, other):
      assert isinstance(other, AbstractRef)
      return AbstractRef(self.inner_aval.join(other.inner_aval))
  
imports: from __future__ import annotations
  from collections.abc import Sequence
  import dataclasses
  import math
  from typing import Any, Generic, TypeVar, Union
  from jax._src import core
  from jax._src import effects
  from jax._src import pretty_printer
  from jax._src.state import indexing
  from jax._src.util import safe_map, safe_zip
  from jax._src.typing import Array
label_desc: Use image node_id 3 for calling the AbstractRef obj's underlying member method code with example usage: obj.join(other) and returns: AbstractRef