diff -r 91a9a4395903 -r 45bfd18835f1 src/Pure/PIDE/markup.scala
--- a/src/Pure/PIDE/markup.scala	Mon Aug 10 20:25:04 2015 +0200
+++ b/src/Pure/PIDE/markup.scala	Mon Aug 10 20:42:59 2015 +0200
@@ -264,7 +264,6 @@
   val ML_TYPING = "ML_typing"
 
   val ML_BREAKPOINT = "ML_breakpoint"
-  val ML_Breakpoint = new Markup_Long(ML_BREAKPOINT, SERIAL)
 
 
   /* outer syntax */