diff -r ec9773fe1dc0 -r ef5f62bf5987 marking2/docdiff_test2.scala
--- a/marking2/docdiff_test2.scala	Tue Oct 29 14:34:51 2019 +0000
+++ b/marking2/docdiff_test2.scala	Tue Oct 29 23:56:13 2019 +0000
@@ -1,4 +1,5 @@
 
+import CW7a._
 
 assert(occurrences(List("a", "b", "b", "c", "d")) == Map("a" -> 1, "b" -> 2, "c" -> 1, "d" -> 1))