From a76c3c6f367565fb7153cd15ea2c08f38ecbe818 Mon Sep 17 00:00:00 2001
From: Waylan Limberg <waylan@gmail.com>
Date: Mon, 25 Feb 2013 10:19:59 -0500
Subject: Missed a set.append -> set.add.

---
 markdown/extensions/toc.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/markdown/extensions/toc.py b/markdown/extensions/toc.py
index 1d6639e..bade490 100644
--- a/markdown/extensions/toc.py
+++ b/markdown/extensions/toc.py
@@ -130,7 +130,7 @@ class TocTreeprocessor(markdown.treeprocessors.Treeprocessor):
         used_ids = set()
         for c in doc.getiterator():
             if "id" in c.attrib:
-                used_ids.append(c.attrib["id"])
+                used_ids.add(c.attrib["id"])
 
         toc_list = []
         marker_found = False
-- 
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