Use weakrefs to hold onto classes #2521.
This also causes the _weakref module to be built into the core.
diff --git a/Lib/test/test_abc.py b/Lib/test/test_abc.py
index b5af46b..6a8c3a1 100644
--- a/Lib/test/test_abc.py
+++ b/Lib/test/test_abc.py
@@ -3,7 +3,7 @@
"""Unit tests for abc.py."""
-import unittest
+import unittest, weakref
from test import test_support
import abc
@@ -208,6 +208,22 @@
C()
self.assertEqual(B.counter, 1)
+ def test_cache_leak(self):
+ # See issue #2521.
+ class A(object):
+ __metaclass__ = abc.ABCMeta
+ @abc.abstractmethod
+ def f(self):
+ pass
+ class C(A):
+ def f(self):
+ A.f(self)
+ r = weakref.ref(C)
+ # Trigger cache.
+ C().f()
+ del C
+ test_support.gc_collect()
+ self.assertEqual(r(), None)
def test_main():
test_support.run_unittest(TestABC)