diff -r 34d2cfb7761a -r 86d59b074abe cw4_marking/c3.sc
--- a/cw4_marking/c3.sc	Fri Sep 18 10:57:24 2026 +0100
+++ b/cw4_marking/c3.sc	Fri Sep 18 10:58:01 2026 +0100
@@ -6,7 +6,7 @@
 
 val ffile = os.read(os.pwd / "br.while")
 
-Try(test_string(ffile, "br")) match {
+Try(urban_test_string(ffile, "br")) match {
   case Success(v) => Console.println(s"   Generated a j-file.")
   case Failure(e) => Console.println(s"   Exception raised.") ; throw(e)
 }