--- a/mercurial/narrowspec.py	Sun Feb 10 14:35:36 2019 -0800
+++ b/mercurial/narrowspec.py	Sat Feb 09 22:50:53 2019 -0800
@@ -127,7 +127,7 @@
         # Passing empty include and empty exclude to matchmod.match()
         # gives a matcher that matches everything, so explicitly use
         # the nevermatcher.
-        return matchmod.never(root, '')
+        return matchmod.never()
     return matchmod.match(root, '', [], include=include or [],
                           exclude=exclude or [])