code: def test_del(self):
      def f(l):
          del l
          return l
  
      tr = self.transform(f, variables)
  
      with self.assertRaisesRegex(
          NameError, "'l' is used before assignment"
      ):
          tr(1)
  
file_path: tensorflow/tensorflow/python/autograph/converters/variables_test.py
imports: from tensorflow.python.autograph.converters import variables
  from tensorflow.python.autograph.core import converter_testing
  from tensorflow.python.platform import test
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