diff -r 31b81f20fd9a -r fbff6f601370 main_testing3/re_test8.scala
--- a/main_testing3/re_test8.scala	Thu Nov 02 13:53:37 2023 +0000
+++ b/main_testing3/re_test8.scala	Thu Nov 02 23:34:53 2023 +0000
@@ -1,8 +1,12 @@
-import M3._ 
-val EVIL_urban = SEQ(STAR(STAR(CHAR('a'))), CHAR('b'))
+
+def urbanmain() = {
+
+  import M3._ 
+  val EVIL_urban = SEQ(STAR(STAR(CHAR('a'))), CHAR('b'))
 
-assert(size(der('a', der('a', EVIL_urban))) == 36)
-assert(size(der('a', der('a', der('a', EVIL_urban)))) == 83)
+  assert(size(der('a', der('a', EVIL_urban))) == 36)
+  assert(size(der('a', der('a', der('a', EVIL_urban)))) == 83)
 
-assert(size(ders("aaaaaa".toList, EVIL_urban)) == 7)
-assert(size(ders(("a" * 50).toList, EVIL_urban)) == 7)
+  assert(size(ders("aaaaaa".toList, EVIL_urban)) == 7)
+  assert(size(ders(("a" * 50).toList, EVIL_urban)) == 7)
+}