From d1ab6089ff2b4f1277676a5feac11d311b2c52ab Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Fri, 1 Jun 2012 11:18:22 -0700
Subject: check return for error

---
 Python/ceval.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Python/ceval.c b/Python/ceval.c
index 718bb32..b3ec013 100644
--- a/Python/ceval.c
+++ b/Python/ceval.c
@@ -3107,6 +3107,8 @@ format_missing(const char *kind, PyCodeObject *co, PyObject *names)
         tail = PyUnicode_FromFormat(", %U, and %U",
                                     PyList_GET_ITEM(names, len - 2),
                                     PyList_GET_ITEM(names, len - 1));
+        if (tail == NULL)
+            return;
         /* Chop off the last two objects in the list. This shouldn't actually
            fail, but we can't be too careful. */
         err = PyList_SetSlice(names, len - 2, len, NULL);
-- 
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