diff -r a4b2bb0dab08 -r 825456e5db30 src/Pure/General/markup.scala
--- a/src/Pure/General/markup.scala	Sun May 30 14:21:35 2010 +0200
+++ b/src/Pure/General/markup.scala	Sun May 30 15:27:49 2010 +0200
@@ -144,6 +144,7 @@
   val COMMAND_DECL = "command_decl"
 
   val KEYWORD = "keyword"
+  val OPERATOR = "operator"
   val COMMAND = "command"
   val IDENT = "ident"
   val STRING = "string"