class_docstr: A bounded functional stack implementation. Elements may be pytrees.
code: def unflatten(treedef, leaves):
      return Stack(
          leaves[0], jax.tree_util.tree_unflatten(treedef, leaves[1:])
      )
  
file_path: jax/jax/_src/lax/stack.py
imports: from __future__ import annotations
  from typing import Any
  import jax
  from jax import lax
  import jax.numpy
label_desc: Use image node_id 8 for calling the Stack obj's underlying member method code with example usage: obj.unflatten(treedef, leaves) and returns: Stack