code: def test_subclass_with_custom_hash(self):
      # Bug #1257731
      class H(WeakSet):
          def __hash__(self):
              return int(id(self) & 0x7FFFFFFF)
  
      s = H()
      f = set()
      f.add(s)
      self.assertIn(s, f)
      f.remove(s)
      f.add(s)
      f.discard(s)
  
imports: import unittest
  from weakref import WeakSet
  import copy
  import string
  from collections import UserString
  from collections.abc import Set, MutableSet
  import gc
  import contextlib
  from test import support
label_desc: Use image node_id 19 for calling the TestWeakSet obj's underlying member method code with example usage: obj.test_subclass_with_custom_hash() and returns: int