diff -r d9a54c4c9da9 -r 3cc73d00553c src/Pure/System/scala.scala
--- a/src/Pure/System/scala.scala	Sat Nov 28 20:18:29 2020 +0100
+++ b/src/Pure/System/scala.scala	Sat Nov 28 21:56:24 2020 +0100
@@ -243,4 +243,5 @@
   Scala.Sleep,
   Scala.Toplevel,
   Doc.Doc_Names,
-  Bibtex.Check_Database)
+  Bibtex.Check_Database,
+  Isabelle_Tool.Isabelle_Tools)