--- a/hgext/highlight/__init__.py	Thu Dec 27 21:27:43 2018 -0500
+++ b/hgext/highlight/__init__.py	Thu Dec 27 21:46:03 2018 -0500
@@ -87,7 +87,7 @@
     ]))
     return web.res.sendresponse()
 
-def extsetup():
+def extsetup(ui):
     # monkeypatch in the new version
     extensions.wrapfunction(webcommands, '_filerevision',
                             filerevision_highlight)