--- a/mercurial/revlog.py	Wed Sep 04 00:13:45 2019 +0200
+++ b/mercurial/revlog.py	Wed Sep 04 00:34:03 2019 +0200
@@ -113,7 +113,7 @@
 
 # Flag processors for REVIDX_ELLIPSIS.
 def ellipsisreadprocessor(rl, text):
-    return text, False
+    return text, False, {}
 
 def ellipsiswriteprocessor(rl, text):
     return text, False