code: def test_module_function(self):
      with self.assertRaisesRegex(
          TypeError,
          r"f\(\) missing 2 required positional arguments: 'a' and 'b'",
      ):
          global_pos_only_f()
  
imports: import dis
  import pickle
  import unittest
  from test.support import check_syntax_error
label_desc: Use image node_id 19 for calling the PositionalOnlyTestCase obj's underlying member method code with example usage: obj.test_module_function() without return types