mercurial/filelog.py

--- a/mercurial/filelog.py	Mon Sep 24 11:16:33 2018 -0700
+++ b/mercurial/filelog.py	Mon Sep 24 12:42:03 2018 -0700
@@ -203,11 +203,6 @@
     def indexfile(self, value):
         self._revlog.indexfile = value
 
-    # Unused.
-    @property
-    def opener(self):
-        return self._revlog.opener
-
     # Used by repo upgrade.
     def clone(self, tr, destrevlog, **kwargs):
         if not isinstance(destrevlog, filelog):