code: def test_isdill():
      obj_io = StringIO()
      pickler = pickle.Pickler(obj_io)
      assert pickle._dill.is_dill(pickler) is True
  
      pickler = pickle._dill.StockPickler(obj_io)
      assert pickle._dill.is_dill(pickler) is False
  
      try:
          import multiprocess as mp
  
          pickler = mp.reduction.ForkingPickler(obj_io)
          assert pickle._dill.is_dill(pickler, child=True) is True
          assert pickle._dill.is_dill(pickler, child=False) is False
      except Exception:
          pass
  
imports: import dill
  from io import BytesIO
label_desc: Use image node_id 3 for calling a global function with example usage: test_isdill() without return types