diff -r 5a93b8f928a2 -r 76acce58aeab src/Pure/System/invoke_scala.scala
--- a/src/Pure/System/invoke_scala.scala	Thu Apr 03 10:51:24 2014 +0200
+++ b/src/Pure/System/invoke_scala.scala	Thu Apr 03 13:46:18 2014 +0200
@@ -89,7 +89,7 @@
   }
 
   private def invoke_scala(
-    prover: Session.Prover, msg: Isabelle_Process.Protocol_Output): Boolean = synchronized
+    prover: Session.Prover, msg: Prover.Protocol_Output): Boolean = synchronized
   {
     msg.properties match {
       case Markup.Invoke_Scala(name, id) =>
@@ -105,7 +105,7 @@
   }
 
   private def cancel_scala(
-    prover: Session.Prover, msg: Isabelle_Process.Protocol_Output): Boolean = synchronized
+    prover: Session.Prover, msg: Prover.Protocol_Output): Boolean = synchronized
   {
     msg.properties match {
       case Markup.Cancel_Scala(id) =>