code: def test_copy_is_taken(self):
      F = self.fragment("if True: x = 4")
      T1 = F.root
      T2 = F.copy()
      self.assertEqual("x", T2.stats[0].if_clauses[0].body.lhs.name)
      T2.stats[0].if_clauses[0].body.lhs.name = "other"
      self.assertEqual("x", T1.stats[0].if_clauses[0].body.lhs.name)
  
file_path: catboost/contrib/tools/cython/Cython/Compiler/Tests/TestTreeFragment.py
imports: from Cython.TestUtils import CythonTest
  from Cython.Compiler.TreeFragment import *
  from Cython.Compiler.Nodes import *
  from Cython.Compiler.UtilNodes import *
  import Cython.Compiler.Naming
label_desc: Use image node_id 2 for calling the TestTreeFragments obj's underlying member method code with example usage: obj.test_copy_is_taken() without return types