code: def test_tuple_unpacking(self):
      def f(x_list):
          z = custom_constant(
              0
          )  # pylint:disable=undefined-variable # noqa: F821
          for i, x in enumerate(x_list):
              z = z + x + i
          return z
  
      self.assertTransformedResult(f, [3, 3], 7)
  
imports: import collections
  from nvidia.dali._autograph.converters import break_statements
  from nvidia.dali._autograph.converters import continue_statements
  from nvidia.dali._autograph.converters import control_flow
  from nvidia.dali._autograph.core import converter_testing
  from nvidia.dali._autograph.utils.all_utils import custom_constant
label_desc: Use image node_id 4 for calling the ForStatementTest obj's underlying member method code with example usage: obj.test_tuple_unpacking() and returns: z