diff -r a64c9a1007ee -r 12c4957c15a9 progs/fun.scala
--- a/progs/fun.scala	Mon Oct 07 20:53:25 2019 +0100
+++ b/progs/fun.scala	Tue Oct 08 21:12:52 2019 +0100
@@ -212,8 +212,8 @@
 //compile_and_run("defs")
 
 
-def main(args: Array[String]) = 
+def main(args: Array[String]) : Unit = 
    compile_and_run(args(0))
 
 
-}
\ No newline at end of file
+}