diff -r ccfce105e36b -r 1e1b0fe66107 handouts/ho04.tex
--- a/handouts/ho04.tex	Fri Oct 09 14:48:06 2015 +0100
+++ b/handouts/ho04.tex	Fri Oct 16 08:42:21 2015 +0100
@@ -90,7 +90,7 @@
 \pcode{Empty}.
  
  {\small\lstinputlisting[language=Scala,numbers=none]
-{../progs/app03.scala}}
+{../progs/app01.scala}}
 
  
 {\small\lstinputlisting[language=Scala,numbers=none]