commit b335dfe7fa95c8c68630e8f7dc738c7b66637e87
author Raymond Hettinger <python@rcn.com> Sun Jan 25 16:38:52 2015 -0800
committer Raymond Hettinger <python@rcn.com> Sun Jan 25 16:38:52 2015 -0800
tree 9f6546fdcb24f2b526f6debe48617d8fcbf94774
parent 4d45c1069b014581c7be4b38a89c36bc57d3c216

Set the hash values of dummy entries to -1.  Improves quality of entry->hash == hash tests.

Objects/setobject.c

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 @@
         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 @@
     }
     key = entry->key;
     entry->key = dummy;
+    entry->hash = -1;
     so->used--;
     so->finger = i + 1;         /* next place to start */
     return key;