From e7dfeeb889ef1f19fc4c26bab843e913ee67e40d Mon Sep 17 00:00:00 2001
From: Benjamin Peterson <benjamin@python.org>
Date: Sun, 17 Oct 2010 21:27:01 +0000
Subject: [PATCH] -1 is reserved for errors

---
 Objects/typeobject.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/Objects/typeobject.c b/Objects/typeobject.c
index a3905d84c70..2c1bf88db81 100644
--- a/Objects/typeobject.c
+++ b/Objects/typeobject.c
@@ -4959,6 +4959,9 @@ slot_tp_hash(PyObject *self)
         PyErr_Clear();
         h = PyLong_Type.tp_hash(res);
     }
+    /* -1 is reserved for errors. */
+    if (h == -1)
+        h = -2;
     Py_DECREF(res);
     return h;
 }