diff --git a/mercurial/localrepo.py b/mercurial/localrepo.py
--- a/mercurial/localrepo.py
+++ b/mercurial/localrepo.py
@@ -1333,6 +1333,8 @@ class localrepository(repo.repository):
 
         def mfmatches(ctx):
             mf = ctx.manifest().copy()
+            if match.always():
+                return mf
             for fn in mf.keys():
                 if not match(fn):
                     del mf[fn]
diff --git a/mercurial/match.py b/mercurial/match.py
--- a/mercurial/match.py
+++ b/mercurial/match.py
@@ -118,6 +118,8 @@ class match(object):
         return self._files
     def anypats(self):
         return self._anypats
+    def always(self):
+        return False
 
 class exact(match):
     def __init__(self, root, cwd, files):
@@ -126,6 +128,8 @@ class exact(match):
 class always(match):
     def __init__(self, root, cwd):
         match.__init__(self, root, cwd, [])
+    def always(self):
+        return True
 
 class narrowmatcher(match):
     """Adapt a matcher to work on a subdirectory only.