diff -r 50d9de61ce02 -r a04b2c010d03 mercurial/revlog.py
--- a/mercurial/revlog.py	Fri Sep 06 23:43:06 2019 +0200
+++ b/mercurial/revlog.py	Fri Sep 06 23:50:32 2019 +0200
@@ -1842,8 +1842,8 @@
         if flags:
             node = node or self.hash(text, p1, p2)
 
-        rawtext, validatehash = self._processflagswrite(text, flags,
-                                                        sidedata=sidedata)
+        rawtext, validatehash = flagutil.processflagswrite(self, text, flags,
+                                                           sidedata=sidedata)
 
         # If the flag processor modifies the revision data, ignore any provided
         # cachedelta.