--- a/mercurial/localrepo.py	Sun Mar 03 17:22:03 2019 -0800
+++ b/mercurial/localrepo.py	Mon Mar 04 16:08:44 2019 +0100
@@ -2224,8 +2224,12 @@
             l.lock()
             return l
 
-        l = self._lock(self.svfs, "lock", wait, None,
-                       self.invalidate, _('repository %s') % self.origroot)
+        l = self._lock(vfs=self.svfs,
+                       lockname="lock",
+                       wait=wait,
+                       releasefn=None,
+                       acquirefn=self.invalidate,
+                       desc=_('repository %s') % self.origroot)
         self._lockref = weakref.ref(l)
         return l