--- a/main_marking3/re_test1.scala	Sun Sep 15 12:57:59 2024 +0100
+++ b/main_marking3/re_test1.scala	Mon Jul 21 16:38:07 2025 +0100
@@ -1,14 +1,17 @@
-import M3._
-
-assert(nullable(ZERO) == false)
-assert(nullable(ONE) == true)
-assert(nullable(CHAR('a')) == false)
-assert(nullable(ZERO | ONE) == true)
-assert(nullable(ZERO | CHAR('a')) == false)
-assert(nullable(ONE ~  ONE) == true)
-assert(nullable(ONE ~ CHAR('a')) == false)
-assert(nullable(STAR(ZERO)) == true)
-assert(nullable(ALTs(List(ONE, CHAR('a'), ZERO))) == true)
-assert(nullable(SEQs(List(ONE, ALTs(List(ONE, CHAR('a'), ZERO)), STAR(ZERO)))) == true)
 
 
+def urbanmain() = {
+  import M3._
+
+  assert(nullable(ZERO) == false)
+  assert(nullable(ONE) == true)
+  assert(nullable(CHAR('a')) == false)
+  assert(nullable(ZERO | ONE) == true)
+  assert(nullable(ZERO | CHAR('a')) == false)
+  assert(nullable(ONE ~  ONE) == true)
+  assert(nullable(ONE ~ CHAR('a')) == false)
+  assert(nullable(STAR(ZERO)) == true)
+  assert(nullable(ALTs(List(ONE, CHAR('a'), ZERO))) == true)
+  assert(nullable(SEQs(List(ONE, ALTs(List(ONE, CHAR('a'), ZERO)), STAR(ZERO)))) == true)
+}
+