1 files changed, 6 insertions, 0 deletions
diff --git a/Lib/test/test_weakref.py b/Lib/test/test_weakref.py
index 75869a758a..2754cec5a2 100644
--- a/Lib/test/test_weakref.py
+++ b/Lib/test/test_weakref.py
@@ -271,6 +271,12 @@ class ReferencesTestCase(TestBase):
         del f[0]
         self.assertEqual(f.result, 0)
 
+    def test_proxy_bool(self):
+        # Test clearing of SF bug #1170766
+        class List(list): pass
+        lyst = List()
+        self.assertEqual(bool(weakref.proxy(lyst)), bool(lyst))
+
     def test_getweakrefcount(self):
         o = C()
         ref1 = weakref.ref(o)