diff -r bc131735c940 -r 438459a8e48b testing4/re1b_test.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing4/re1b_test.scala	Thu Nov 22 17:35:30 2018 +0000
@@ -0,0 +1,18 @@
+
+//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(der('a', ZERO | ONE) == (ZERO | ZERO))
+  assert(der('a', (CHAR('a') | ONE) ~ CHAR('a')) == ALT((ONE | ZERO) ~ CHAR('a'), ONE))
+  assert(der('a', STAR(CHAR('a'))) == (ONE ~ STAR(CHAR('a'))))
+  assert(der('b', STAR(CHAR('a'))) == (ZERO ~ STAR(CHAR('a'))))
+//}
+
+//Await.result(f, 120 second)