diff -r afab180307be -r 50c922c1b514 mercurial/context.py
--- a/mercurial/context.py	Mon Apr 01 18:48:12 2013 -0300
+++ b/mercurial/context.py	Fri Feb 15 18:07:14 2013 +0900
@@ -291,16 +291,16 @@
             try:
                 return self._manifest[path], self._manifest.flags(path)
             except KeyError:
-                raise error.LookupError(self._node, path,
-                                        _('not found in manifest'))
+                raise error.ManifestLookupError(self._node, path,
+                                                _('not found in manifest'))
         if '_manifestdelta' in self.__dict__ or path in self.files():
             if path in self._manifestdelta:
                 return (self._manifestdelta[path],
                         self._manifestdelta.flags(path))
         node, flag = self._repo.manifest.find(self._changeset[0], path)
         if not node:
-            raise error.LookupError(self._node, path,
-                                    _('not found in manifest'))
+            raise error.ManifestLookupError(self._node, path,
+                                            _('not found in manifest'))
 
         return node, flag