code: def addFailure(self, test, err):
      self._add_result(test, True, failure=self.__makeErrorDict(*err))
      super().addFailure(test, err)
      if support.failfast:
          self.stop()
  
imports: import functools
  import io
  import sys
  import time
  import traceback
  import unittest
  from test import support
label_desc: Use image node_id 8 for calling the RegressionTestResult obj's underlying member method code with example usage: obj.addFailure(test, err) without return types