diff -r 04ad0fed81f5 -r 525a13b9ac74 src/Pure/General/markup.scala
--- a/src/Pure/General/markup.scala	Tue Sep 07 15:03:59 2010 +0200
+++ b/src/Pure/General/markup.scala	Tue Sep 07 16:08:29 2010 +0200
@@ -249,6 +249,8 @@
   val SIGNAL = "signal"
   val EXIT = "exit"
 
+  val BAD = "bad"
+
   val Ready = Markup("ready", Nil)