code: def _maybe_test_internal_error():
      # Simulate an internal error by checking env for a special
      # variable. This is used by Guild tests to verify internal error
      # handling.
      assert os.getenv("__GUILD_OP_MAIN_INTERNAL_ERROR") != "1"
  
imports: import warnings
  import logging
  import os
  import pdb
  import sys
  import traceback
  from guild import exit_code
  from guild import op_util
  from guild import util
label_desc: Use image node_id 29 for calling a global function with example usage: _maybe_test_internal_error() without return types