--- a/mercurial/revset.py	Sat Jan 10 16:41:36 2015 +0900
+++ b/mercurial/revset.py	Sat Jan 10 14:49:50 2015 +0900
@@ -994,7 +994,7 @@
     """
     # i18n: "all" is a keyword
     getargs(x, 0, 0, _("all takes no arguments"))
-    return subset
+    return subset & spanset(repo)  # drop "null" if any
 
 def grep(repo, subset, x):
     """``grep(regex)``