--- a/testing4/postfix_test7.scala	Thu Oct 31 11:33:02 2019 +0000
+++ b/testing4/postfix_test7.scala	Thu Oct 31 12:01:56 2019 +0000
@@ -1,3 +1,5 @@
+import CW9a._
+
 
 assert(syard(split("3 + 4 * ( 2 - 1 )")) == List("3", "4", "2", "1", "-", "*", "+"))
 assert(syard(split("( ( ( 3 ) ) + ( ( 4 + ( 5 ) ) ) )")) == List("3", "4", "5", "+", "+"))