diff -r 0a714a1f7d5c -r f263814c72ac mercurial/manifest.py
--- a/mercurial/manifest.py	Wed Sep 17 22:34:34 2014 +0900
+++ b/mercurial/manifest.py	Fri Mar 13 15:19:54 2015 -0700
@@ -6,9 +6,10 @@
 # GNU General Public License version 2 or any later version.
 
 from i18n import _
-import mdiff, parsers, error, revlog, util
+import mdiff, parsers, error, revlog, util, scmutil
 import array, struct
 
+propertycache = util.propertycache
 
 class _lazymanifest(dict):
     """This is the pure implementation of lazymanifest.
@@ -147,6 +148,13 @@
         files.difference_update(m2)
         return files
 
+    @propertycache
+    def _dirs(self):
+        return scmutil.dirs(self)
+
+    def dirs(self):
+        return self._dirs
+
     def matches(self, match):
         '''generate a new manifest filtered by the match argument'''
         if match.always():