diff -r ec26d6986d85 -r 6cfea6e4c892 mercurial/localrepo.py
--- a/mercurial/localrepo.py	Fri Sep 04 22:26:57 2009 +0200
+++ b/mercurial/localrepo.py	Fri Sep 04 23:34:51 2009 +0200
@@ -459,7 +459,7 @@
                 key = hex(key)
         except:
             pass
-        raise error.RepoError(_("unknown revision '%s'") % key)
+        raise error.RepoLookupError(_("unknown revision '%s'") % key)
 
     def local(self):
         return True