From: Mark Dickinson <dickinsm@gmail.com>
Date: Sat, 17 Oct 2009 21:46:32 +0000 (+0000)
Subject: Protect against attempts to replace PyNumber_Add with PyNumber_InPlaceAdd in builtin sum
X-Git-Tag: v2.7a1~319
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=bfd2dc747979d562916a24c715685d89c194bb56;p=python

Protect against attempts to replace PyNumber_Add with PyNumber_InPlaceAdd in builtin sum
---

diff --git a/Lib/test/test_builtin.py b/Lib/test/test_builtin.py
index 05556169b7..3cd5bd955f 100644
--- a/Lib/test/test_builtin.py
+++ b/Lib/test/test_builtin.py
@@ -1286,6 +1286,10 @@ class BuiltinTest(unittest.TestCase):
                 raise ValueError
         self.assertRaises(ValueError, sum, BadSeq())
 
+        empty = []
+        sum(([x] for x in range(10)), empty)
+        self.assertEqual(empty, [])
+
     def test_type(self):
         self.assertEqual(type(''),  type('123'))
         self.assertNotEqual(type(''), type(()))