--- a/mercurial/revlog.py	Tue Sep 03 23:51:17 2019 +0200
+++ b/mercurial/revlog.py	Wed Sep 04 00:53:27 2019 +0200
@@ -115,7 +115,7 @@
 def ellipsisreadprocessor(rl, text):
     return text, False, {}
 
-def ellipsiswriteprocessor(rl, text):
+def ellipsiswriteprocessor(rl, text, sidedata):
     return text, False
 
 def ellipsisrawprocessor(rl, text):