diff -r 940b6c68102a -r 72688efdf17c testing4/postfix_test8.scala
--- a/testing4/postfix_test8.scala	Thu Oct 31 11:33:02 2019 +0000
+++ b/testing4/postfix_test8.scala	Thu Oct 31 12:01:56 2019 +0000
@@ -1,3 +1,4 @@
+import CW9a._
 
 assert(compute(syard(split("3 + 4 * ( 2 - 1 )"))) == 7)
 assert(compute(syard(split("10 + 12 * 33"))) == 406)