diff -r bc131735c940 -r 438459a8e48b testing4/re1a_test.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing4/re1a_test.scala	Thu Nov 22 17:35:30 2018 +0000
@@ -0,0 +1,21 @@
+
+//import scala.concurrent._
+//import scala.concurrent.duration._
+//import ExecutionContext.Implicits.global
+//import scala.language.postfixOps 
+//import scala.language.reflectiveCalls
+
+//lazy val f = Future {
+  import CW8a._
+
+  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)
+//}
+
+//Await.result(f, 120 second)