code: def test_local_composite_attr(self):
      class TestClass(object):
          def __init__(self):
              self.x = custom_constant(3)
  
      def f(n):
          while n > 0:
              tc = TestClass()
              tc.x = tc.x
              n -= 1
          return n
  
      self.assertTransformedResult(f, custom_constant(5), 0)
  
imports: import collections
  from nvidia.dali._autograph.converters import break_statements
  from nvidia.dali._autograph.converters import continue_statements
  from nvidia.dali._autograph.converters import control_flow
  from nvidia.dali._autograph.core import converter_testing
  from nvidia.dali._autograph.utils.all_utils import custom_constant
label_desc: Use image node_id 6 for calling the WhileStatementTest obj's underlying member method code with example usage: obj.test_local_composite_attr() and returns: n