[asllib][www] Print return code for interpretation

Author: hrutvik

asllib/asllib-www/jaslref.ml

@@ -73,7 +73,9 @@ let run_asl code version exec =
   with
   | Asllib.Error.ASLException e ->
       Printf.eprintf "%s\n%!" (Asllib.Error.error_to_string e)
-  | Exit _ -> ()
+  | Exit code ->
+      if _exec then
+        Printf.printf "ASL: interpretation completed (exit code %n).\n%!" code
 
 (* Expose to JavaScript *)
 let () = Js.Unsafe.global##.runAsl := Js.wrap_callback run_asl