From 66f6238fca7286a3917eab0e9fafd7aa6f8e90a4 Mon Sep 17 00:00:00 2001
From: Raymond Hettinger <python@rcn.com>
Date: Tue, 17 Nov 2015 20:58:43 -0800
Subject: Add assertion to verify the pre-condition in the comments.

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

(limited to 'Objects/setobject.c')

diff --git a/Objects/setobject.c b/Objects/setobject.c
index 083cbea412..7fde01f599 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -269,6 +269,7 @@ set_insert_clean(PySetObject *so, PyObject *key, Py_hash_t hash)
     size_t i = (size_t)hash & mask;
     size_t j;
 
+    assert(so->fill == so->used);
     while (1) {
         entry = &table[i];
         if (entry->key == NULL)
-- 
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