code: def test_pos_is_transferred(self):
      F = self.fragment(
          """
          x = y
          x = u * v ** w
          """
      )
      T = F.substitute({"v": NameNode(pos=None, name="a")})
      v = F.root.stats[1].rhs.operand2.operand1
      a = T.stats[1].rhs.operand2.operand1
      self.assertEqual(v.pos, a.pos)
  
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 6 for calling the TestTreeFragments obj's underlying member method code with example usage: obj.test_pos_is_transferred() without return types