code: def add_scan_configvars():
      config.add(
          "scan__allow_gc",
          "Allow/disallow gc inside of Scan (default: False)",
          BoolParam(False),
          in_c_key=False,
      )
  
      config.add(
          "scan__allow_output_prealloc",
          "Allow/disallow memory preallocation for outputs inside of scan "
          "(default: True)",
          BoolParam(True),
          in_c_key=False,
      )
  
imports: import errno
  import logging
  import os
  import platform
  import re
  import socket
  import sys
  import textwrap
  import numpy
  from setuptools._distutils.spawn import find_executable
  import pytensor
  from pytensor.configparser import BoolParam, ConfigParam, DeviceParam, EnumStr, FloatParam, IntParam, StrParam, _create_default_config
  from pytensor.utils import LOCAL_BITWIDTH, PYTHON_INT_BITWIDTH, call_subprocess_Popen, maybe_add_to_os_environ_pathlist, output_subprocess_Popen
label_desc: Use image node_id 33 for calling a global function with example usage: add_scan_configvars() without return types