diff -r 5b15eee1a661 -r c2ab1a970e82 src/Pure/System/scala.scala
--- a/src/Pure/System/scala.scala	Sat Feb 27 21:01:07 2021 +0100
+++ b/src/Pure/System/scala.scala	Sat Feb 27 21:36:58 2021 +0100
@@ -249,4 +249,5 @@
   Isabelle_System.Copy_Dir,
   Isabelle_System.Copy_File,
   Isabelle_System.Copy_File_Base,
+  Isabelle_System.Download,
   Isabelle_Tool.Isabelle_Tools)