diff -r 8ec5c82b67dc -r b9a5eb0f3b43 src/Pure/build-jars
--- a/src/Pure/build-jars	Mon Apr 06 12:36:00 2020 +0200
+++ b/src/Pure/build-jars	Mon Apr 06 12:53:45 2020 +0200
@@ -28,6 +28,7 @@
   src/Pure/Admin/other_isabelle.scala
   src/Pure/Concurrent/consumer_thread.scala
   src/Pure/Concurrent/counter.scala
+  src/Pure/Concurrent/delay.scala
   src/Pure/Concurrent/event_timer.scala
   src/Pure/Concurrent/future.scala
   src/Pure/Concurrent/isabelle_thread.scala