code: def test_mutation_subscript(self):
      def test_fn(a):
          l = []
          l[0] = a
          return l
  
      node = self._parse_and_analyze(test_fn)
      fn_body = node.body
  
      creation = fn_body[0].targets[0]
      mutation = fn_body[1].targets[0].value
      use = fn_body[2].value
      self.assertSameDef(creation, mutation)
      self.assertSameDef(creation, use)
  
imports: from tensorflow.python.autograph.pyct import anno
  from tensorflow.python.autograph.pyct import cfg
  from tensorflow.python.autograph.pyct import naming
  from tensorflow.python.autograph.pyct import parser
  from tensorflow.python.autograph.pyct import qual_names
  from tensorflow.python.autograph.pyct import transformer
  from tensorflow.python.autograph.pyct.static_analysis import activity
  from tensorflow.python.autograph.pyct.static_analysis import reaching_definitions
  from tensorflow.python.platform import test
label_desc: Use image node_id 11 for calling the ReachingDefinitionsAnalyzerTest obj's underlying member method code with example usage: obj.test_mutation_subscript() and returns: l