Fix:

[ 1229429 ] missing Py_DECREF in PyObject_CallMethod

Add a test in test_enumerate, which is a bit random, but suffices
(reversed_new calls PyObject_CallMethod under some circumstances).

Lib/test/test_enumerate.py

@@ -1,4 +1,5 @@
 import unittest
+import sys
 
 from test import test_support
 
@@ -175,6 +176,25 @@ class TestReversed(unittest.TestCase):
         self.assertRaises(TypeError, reversed)
         self.assertRaises(TypeError, reversed, [], 'extra')
 
+    def test_bug1229429(self):
+        # this bug was never in reversed, it was in
+        # PyObject_CallMethod, and reversed_new calls that sometimes.
+        if not hasattr(sys, "getrefcount"):
+            return
+        def f():
+            pass
+        r = f.__reversed__ = object()
+        rc = sys.getrefcount(r)
+        for i in range(10):
+            try:
+                reversed(f)
+            except TypeError:
+                pass
+            else:
+                self.fail("non-callable __reversed__ didn't raise!")
+        self.assertEqual(rc, sys.getrefcount(r))
+            
+
 def test_main(verbose=None):
     testclasses = (EnumerateTestCase, SubclassTestCase, TestEmpty, TestBig,
                    TestReversed)