code: def test_flatmapping_isinstance(self):
      # Note: This should not work (FlatMapping extends FlatMap not the other way
      # around) however it is needed to support some naughty users who reached in
      # to Haiku internals and depend on the name `data_structures.FlatMapping`.
      o = FlatMap({})
      self.assertIsInstance(o, data_structures.FlatMapping)
  
imports: import collections
  import copy
  import pickle
  import threading
  from absl.testing import absltest
  from absl.testing import parameterized
  import cloudpickle
  import dill
  from haiku._src import data_structures
  import jax
  import tree
label_desc: Use image node_id 17 for calling the FlatMappingTest obj's underlying member method code with example usage: obj.test_flatmapping_isinstance() without return types