diff -r 5036edb025b7 -r d5773922358d src/Pure/Concurrent/future.scala
--- a/src/Pure/Concurrent/future.scala	Sat Apr 04 18:13:05 2020 +0200
+++ b/src/Pure/Concurrent/future.scala	Sat Apr 04 19:18:19 2020 +0200
@@ -135,7 +135,7 @@
 {
   private val result = Future.promise[A]
   private val thread =
-    Standard_Thread.fork(name, daemon) { result.fulfill_result(Exn.capture(body)) }
+    Standard_Thread.fork(name = name, daemon = daemon) { result.fulfill_result(Exn.capture(body)) }
 
   def peek: Option[Exn.Result[A]] = result.peek
   def join_result: Exn.Result[A] = result.join_result