code: def stack_copy(
      stack: List[Tuple[DFAS, int, RawNode]]
  ) -> List[Tuple[DFAS, int, RawNode]]:
      """Nodeless stack copy."""
      return [(dfa, label, DUMMY_NODE) for dfa, label, _ in stack]
  
imports: from contextlib import contextmanager
  from typing import TYPE_CHECKING, Any, Callable, Dict, Iterator, List, Optional, Set, Tuple, Union, cast
  from blib2to3.pgen2.grammar import Grammar
  from blib2to3.pytree import NL, Context, Leaf, Node, RawNode, convert
  from .None import grammar, token, tokenize
label_desc: Use image node_id 2 for calling a global function with example usage: stack_copy(stack) and returns: unknown