diff -r d0caa12ab8d8 -r 45557ad18ea6 progs/hello-world.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/progs/hello-world.scala	Thu Nov 10 04:02:45 2016 +0000
@@ -0,0 +1,3 @@
+object Hello extends App { 
+  println("hello world")
+}