code: def test_subs_with_surprisingly_friendly_eq():
      try:
          import pandas as pd
      except ImportError:
          return
      else:
          df = pd.DataFrame()
          assert subs(df, "x", 1) is df
  
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 22 for calling a global function with example usage: test_subs_with_surprisingly_friendly_eq() without return types