diff -r 5ffc6c18fb96 -r bea4717415c0 mercurial/upgrade_utils/engine.py
--- a/mercurial/upgrade_utils/engine.py	Fri May 07 08:38:17 2021 -0700
+++ b/mercurial/upgrade_utils/engine.py	Fri May 07 22:06:25 2021 -0400
@@ -134,7 +134,7 @@
     sidedata_helpers,
     oncopiedrevision,
 ):
-    """ returns the new revlog object created"""
+    """returns the new revlog object created"""
     newrl = None
     if matchrevlog(upgrade_op.revlogs_to_process, rl_type):
         ui.note(