diff -r a6cbf8ce979e -r 53e8858b839f src/Pure/System/scala.scala
--- a/src/Pure/System/scala.scala	Wed Aug 26 15:59:21 2020 +0100
+++ b/src/Pure/System/scala.scala	Thu Aug 27 12:34:10 2020 +0200
@@ -211,7 +211,7 @@
       }
     }
 
-    val functions =
+    override val functions =
       List(
         Markup.Invoke_Scala.name -> invoke_scala,
         Markup.Cancel_Scala.name -> cancel_scala)