--- a/progs/app4.scala	Tue Sep 24 01:56:53 2013 +0100
+++ b/progs/app4.scala	Tue Sep 24 23:16:00 2013 +0100
@@ -9,6 +9,7 @@
     println(s"Visiting: $n $url")
     val page = get_page(url)
     println(email_pattern.findAllIn(page).mkString("\n"))
-    for (u <- get_all_URLs(page)) crawl(u, n - 1)
+    for (u <- get_all_URLs(page)) 
+      crawl(u, n - 1)
   }
 }