code: def test_subs_arbitrary_key():
      key = (1.2, "foo", (3,))
      assert subs((id, key), key, 1) == (id, 1)
  
imports: from __future__ import annotations
  import pickle
  from collections import namedtuple
  import pytest
  from dask.core import flatten, get, get_dependencies, get_deps, getcycle, has_tasks, ishashable, iskey, istask, literal, preorder_traversal, quote, subs, validate_key
  from dask.utils_test import GetFunctionTestMixin, add, inc
label_desc: Use image node_id 23 for calling a global function with example usage: test_subs_arbitrary_key() without return types