diff -r 3020f8c76baa -r 9e7897f25e13 testing4/re_test3.scala
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/testing4/re_test3.scala	Thu Nov 29 17:15:11 2018 +0000
@@ -0,0 +1,13 @@
+
+
+
+assert(simp(ZERO | ONE) == ONE)
+assert(simp(STAR(ZERO | ONE)) == STAR(ZERO | ONE))
+assert(simp(ONE ~ (ONE ~ (ONE ~ CHAR('a')))) == CHAR('a'))
+assert(simp(ONE ~ (ONE ~ (ONE ~ ZERO))) == ZERO)
+assert(simp(ALT(ONE ~ (ONE ~ (ONE ~ ZERO)), CHAR('a'))) == CHAR('a'))
+assert(simp(CHAR('a') | CHAR('a')) == CHAR('a'))
+assert(simp(ONE | CHAR('a')) == (ONE | CHAR('a')))
+assert(simp(ALT((CHAR('a') | ZERO) ~ ONE,
+               ((ONE | CHAR('b')) | CHAR('c')) ~ (CHAR('d') ~ ZERO))) == CHAR('a'))
+