diff --git a/hgext/narrow/narrowrevlog.py b/hgext/narrow/narrowrevlog.py
--- a/hgext/narrow/narrowrevlog.py
+++ b/hgext/narrow/narrowrevlog.py
@@ -116,12 +116,12 @@
         # This function is called via debug{revlog,index,data}, but also during
         # at least some push operations. This will be used to wrap/exclude the
         # child directories when using treemanifests.
-        def dirlog(self, dir):
-            if dir and not dir.endswith('/'):
-                dir = dir + '/'
-            if not repo.narrowmatch().visitdir(dir[:-1] or '.'):
-                return excludedmanifestrevlog(dir)
-            result = super(narrowmanifestrevlog, self).dirlog(dir)
+        def dirlog(self, d):
+            if d and not d.endswith('/'):
+                d = d + '/'
+            if not repo.narrowmatch().visitdir(d[:-1] or '.'):
+                return excludedmanifestrevlog(d)
+            result = super(narrowmanifestrevlog, self).dirlog(d)
             makenarrowmanifestrevlog(result, repo)
             return result
 
diff --git a/mercurial/manifest.py b/mercurial/manifest.py
--- a/mercurial/manifest.py
+++ b/mercurial/manifest.py
@@ -1245,15 +1245,15 @@
         self._fulltextcache.clear()
         self._dirlogcache = {'': self}
 
-    def dirlog(self, dir):
-        if dir:
+    def dirlog(self, d):
+        if d:
             assert self._treeondisk
-        if dir not in self._dirlogcache:
-            mfrevlog = manifestrevlog(self.opener, dir,
+        if d not in self._dirlogcache:
+            mfrevlog = manifestrevlog(self.opener, d,
                                       self._dirlogcache,
                                       treemanifest=self._treeondisk)
-            self._dirlogcache[dir] = mfrevlog
-        return self._dirlogcache[dir]
+            self._dirlogcache[d] = mfrevlog
+        return self._dirlogcache[d]
 
     def add(self, m, transaction, link, p1, p2, added, removed, readtree=None):
         if (p1 in self.fulltextcache and util.safehasattr(m, 'fastdelta')