code: def test_operators_notimplemented():
      """#393: need to return NotSupported to ensure correct arithmetic operator behavior"""
  
      c1, c2 = m.C1(), m.C2()
      assert c1 + c1 == 11
      assert c2 + c2 == 22
      assert c2 + c1 == 21
      assert c1 + c2 == 12
  
file_path: coremltools/deps/pybind11/tests/test_operator_overloading.py
imports: import pytest
  from pybind11_tests import ConstructorStats
  from pybind11_tests import operators
label_desc: Use image node_id 2 for calling a global function with example usage: test_operators_notimplemented() without return types