diff -r 52528570312e -r 70f8c64812db mercurial/changegroup.py
--- a/mercurial/changegroup.py	Sat Mar 13 00:40:46 2021 -0500
+++ b/mercurial/changegroup.py	Sat Mar 13 00:41:37 2021 -0500
@@ -1162,9 +1162,10 @@
         def makelookupmflinknode(tree, nodes):
             if fastpathlinkrev:
                 assert not tree
-                return (
-                    manifests.__getitem__
-                )  # pytype: disable=unsupported-operands
+
+                # pytype: disable=unsupported-operands
+                return manifests.__getitem__
+                # pytype: enable=unsupported-operands
 
             def lookupmflinknode(x):
                 """Callback for looking up the linknode for manifests.