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: import pickle
  from collections import namedtuple
  import pytest
  from flash.core.serve.dag.task import flatten, get, get_dependencies, get_deps, istask, literal, preorder_traversal, quote, subs
  from flash.core.serve.dag.utils_test import add, inc
  from flash.core.utilities.imports import _TOPIC_SERVE_AVAILABLE
label_desc: Use image node_id 16 for calling a global function with example usage: test_subs_with_surprisingly_friendly_eq() without return types