diff -r f63299ee7e4d -r 45f0d5297698 mercurial/revlog.py
--- a/mercurial/revlog.py	Wed Mar 10 19:33:18 2021 +0100
+++ b/mercurial/revlog.py	Fri Feb 19 11:15:42 2021 +0100
@@ -2733,6 +2733,7 @@
         revisiondata=False,
         assumehaveparentrevisions=False,
         deltamode=repository.CG_DELTAMODE_STD,
+        sidedata_helpers=None,
     ):
         if nodesorder not in (b'nodes', b'storage', b'linear', None):
             raise error.ProgrammingError(
@@ -2761,6 +2762,7 @@
             deltamode=deltamode,
             revisiondata=revisiondata,
             assumehaveparentrevisions=assumehaveparentrevisions,
+            sidedata_helpers=sidedata_helpers,
         )
 
     DELTAREUSEALWAYS = b'always'