--- a/core_marking1/collatz_test3.scala	Sun Jan 15 10:58:13 2023 +0000
+++ b/core_marking1/collatz_test3.scala	Sat Mar 11 22:01:53 2023 +0000
@@ -1,4 +1,12 @@
+import scala.concurrent._
+import scala.concurrent.duration._
+import ExecutionContext.Implicits.global
+import scala.language.postfixOps 
 
+lazy val f = Future {
 assert(C1.last_odd(113) == 85)
 assert(C1.last_odd(84) == 21)
 assert(C1.last_odd(605) == 341)
+}
+
+Await.result(f, 32 second)