diff -r 4f6a6ba7387d -r 2cb2606ce075 src/Pure/Concurrent/delay.scala
--- a/src/Pure/Concurrent/delay.scala	Thu Mar 31 21:48:08 2022 +0200
+++ b/src/Pure/Concurrent/delay.scala	Thu Mar 31 21:51:19 2022 +0200
@@ -33,8 +33,7 @@
     }
   }
 
-  def invoke(): Unit = synchronized
-  {
+  def invoke(): Unit = synchronized {
     val new_run =
       running match {
         case Some(request) => if (first) false else { request.cancel(); true }
@@ -44,16 +43,14 @@
       running = Some(Event_Timer.request(Time.now() + delay)(run))
   }
 
-  def revoke(): Unit = synchronized
-  {
+  def revoke(): Unit = synchronized {
     running match {
       case Some(request) => request.cancel(); running = None
       case None =>
     }
   }
 
-  def postpone(alt_delay: Time): Unit = synchronized
-  {
+  def postpone(alt_delay: Time): Unit = synchronized {
     running match {
       case Some(request) =>
         val alt_time = Time.now() + alt_delay