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[obsolete] code section comment for repo subclassing

diff --git a/hgext/obsolete.py b/hgext/obsolete.py
--- a/hgext/obsolete.py
+++ b/hgext/obsolete.py
@@ -283,6 +283,9 @@ def _obsdeserialise(flike):
         rels.setdefault( subnode, set()).add(bin(objhex))
     return rels
 
+### repo subclassing
+#############################
+
 def reposetup(ui, repo):
 
     if not repo.local():