diff -r c493eaba6018 -r 65731df141a5 marking4/postfix_test8.scala
--- a/marking4/postfix_test8.scala	Wed Oct 30 12:47:10 2019 +0000
+++ b/marking4/postfix_test8.scala	Wed Oct 30 14:07:58 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)