code: def test_del(self):
      def f(l):
          del l
          return l  # noqa: F821
  
      tr = self.transform(f, variables)
  
      with self.assertRaisesRegex(
          NameError, "'l' is used before assignment"
      ):
          tr(1)
  
file_path: DALI/dali/test/python/autograph/converters/test_variables.py
imports: from nvidia.dali._autograph.converters import variables
  from nvidia.dali._autograph.core import converter_testing
label_desc: Use image node_id 4 for calling the VariablesTest obj's underlying member method code with example usage: obj.test_del() and returns: l