diff -r 305e1dcdb3bc -r 9476aee44eed progs/hello-world.scala
--- a/progs/hello-world.scala	Thu Apr 23 14:49:54 2020 +0100
+++ b/progs/hello-world.scala	Wed Aug 12 00:56:20 2020 +0100
@@ -1,3 +1,14 @@
-object Hello extends App { 
+object Hello //extends App 
+{ 
+  var x = 1 
+
+  println("test")
+
+  x = x + 2
+
+  println("foo")
+
+  synchronized { x = x + 1 }
+
   println("hello world")
 }