From b335dfe7fa95c8c68630e8f7dc738c7b66637e87 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Sun, 25 Jan 2015 16:38:52 -0800
Subject: Set the hash values of dummy entries to -1.  Improves quality of
 entry->hash == hash tests.

---
 Objects/setobject.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Objects/setobject.c b/Objects/setobject.c
index 8a2f351..f44f562 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -337,6 +337,7 @@ set_discard_entry(PySetObject *so, setentry *oldentry)
         return DISCARD_NOTFOUND;
     old_key = entry->key;
     entry->key = dummy;
+    entry->hash = -1;
     so->used--;
     Py_DECREF(old_key);
     return DISCARD_FOUND;
@@ -621,6 +622,7 @@ set_pop(PySetObject *so)
     }
     key = entry->key;
     entry->key = dummy;
+    entry->hash = -1;
     so->used--;
     so->finger = i + 1;         /* next place to start */
     return key;
-- 
cgit v0.12