diff -r 2f80eaf38ed4 -r 44c98cbc665f mercurial/filelog.py
--- a/mercurial/filelog.py	Fri Sep 28 09:28:38 2018 -0700
+++ b/mercurial/filelog.py	Fri Sep 28 09:33:05 2018 -0700
@@ -71,10 +71,6 @@
     def iscensored(self, rev):
         return self._revlog.iscensored(rev)
 
-    # Might be unused.
-    def checkhash(self, text, node, p1=None, p2=None, rev=None):
-        return self._revlog.checkhash(text, node, p1=p1, p2=p2, rev=rev)
-
     def revision(self, node, _df=None, raw=False):
         return self._revlog.revision(node, _df=_df, raw=raw)