diff -r 6ceb3721e203 -r 8864aa96f1f6 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Sun Oct 13 14:40:00 2019 +0200
+++ b/mercurial/localrepo.py	Sun Oct 13 02:05:19 2019 +0200
@@ -1907,7 +1907,7 @@
                 # Wrap old filters not supporting keyword arguments
                 if not pycompat.getargspec(fn)[2]:
                     oldfn = fn
-                    fn = lambda s, c, **kwargs: oldfn(s, c)
+                    fn = lambda s, c, oldfn=oldfn, **kwargs: oldfn(s, c)
                     fn.__name__ = 'compat-' + oldfn.__name__
                 l.append((mf, fn, params))
             self._filterpats[filter] = l