rsc: fix main

more message here.

Change-Id: Idbe79f0340f398d5bfcb52eaa24ff91dbb0104e8
Reviewed-on: https://go-review.googlesource.com/3643
Reviewed-by: Russ Cox <rsc@golang.org>
diff --git a/rsc/main.go b/rsc/main.go
index 3ed81c5..4865477 100644
--- a/rsc/main.go
+++ b/rsc/main.go
@@ -1,5 +1,6 @@
 package main
 
 func main() {
+	println("main")
 	greeting()
 }