--- a/mercurial/hgweb/webcommands.py	Fri Mar 12 19:02:07 2021 -0500
+++ b/mercurial/hgweb/webcommands.py	Fri Mar 12 20:25:12 2021 -0500
@@ -1156,6 +1156,7 @@
 
     linerange = None
     if lrange is not None:
+        assert lrange is not None  # help pytype (!?)
         linerange = webutil.formatlinerange(*lrange)
         # deactivate numeric nav links when linerange is specified as this
         # would required a dedicated "revnav" class