code: def __call__(self, a):
      return a
  
file_path: dm-haiku/haiku/_src/typing_test.py
imports: from typing import Protocol
  from absl.testing import absltest
  from absl.testing import parameterized
  from haiku._src import module
  from haiku._src import test_utils
  from haiku._src import typing
label_desc: Use image node_id 1 for calling the CallableModule obj's underlying member method code with example usage: obj.__call__(a) and returns: a