From 97979ddc141b88cfd81bdf02404d0337a603f7cf Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Fri, 12 Aug 2005 23:58:22 +0000
Subject: * Fix SF #1257731.  Make __contains__(), remove(), and discard() only
 do   a frozenset conversion when the initial search attempt fails with a  
 TypeError and the key is some type of set.  Add a testcase.

* Eliminate a duplicate if-stmt.
---
 Lib/test/test_set.py | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/Lib/test/test_set.py b/Lib/test/test_set.py
index a21d53c..f393712 100644
--- a/Lib/test/test_set.py
+++ b/Lib/test/test_set.py
@@ -213,6 +213,19 @@ class TestJointOps(unittest.TestCase):
             elem.sub = elem
             elem.set = set([elem])
 
+    def test_subclass_with_custom_hash(self):
+        # Bug #1257731
+        class H(self.thetype):
+            def __hash__(self):
+                return id(self)
+        s=H()
+        f=set()
+        f.add(s)
+        self.assert_(s in f)
+        f.remove(s)
+        f.add(s)
+        f.discard(s)
+
 class TestSet(TestJointOps):
     thetype = set
 
-- 
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