--- a/mercurial/repository.py	Mon Sep 24 09:38:27 2018 -0700
+++ b/mercurial/repository.py	Thu Sep 20 19:31:07 2018 -0700
@@ -485,9 +485,6 @@
     * DAG data (storing and querying the relationship between nodes).
     * Metadata to facilitate storage.
     """
-    index = interfaceutil.Attribute(
-        """An ``ifilerevisionssequence`` instance.""")
-
     def __len__():
         """Obtain the number of revisions stored for this file."""