code: def test_rename_symbols_function(self):
      node = parser.parse("def f():\n  pass")
      node = ast_util.rename_symbols(
          node, {qual_names.QN("f"): qual_names.QN("f1")}
      )
  
      source = parser.unparse(node, include_encoding_marker=False)
      self.assertEqual(source.strip(), "def f1():\n    pass")
  
imports: import ast
  import collections
  import textwrap
  import unittest
  import gast
  from nvidia.dali._autograph.pyct import anno
  from nvidia.dali._autograph.pyct import ast_util
  from nvidia.dali._autograph.pyct import loader
  from nvidia.dali._autograph.pyct import parser
  from nvidia.dali._autograph.pyct import pretty_printer
  from nvidia.dali._autograph.pyct import qual_names
label_desc: Use image node_id 8 for calling the AstUtilTest obj's underlying member method code with example usage: obj.test_rename_symbols_function() without return types