diff --git a/code/compiler/11/examples/works3.txt b/code/compiler/11/examples/works3.txt
index 2123089..cfd2ef3 100644
--- a/code/compiler/11/examples/works3.txt
+++ b/code/compiler/11/examples/works3.txt
@@ -1,4 +1,4 @@
-data List = { Nil, Cons Int List }
+data List a = { Nil, Cons a (List a) }
 data Bool = { True, False }
 defn length l = {
     case l of {
@@ -6,4 +6,4 @@ defn length l = {
         Cons x xs -> { 1 + length xs }
     }
 }
-defn main = { length (Cons True (Cons False (Cons True Nil))) }
+defn main = { length (Cons 1 (Cons 2 (Cons 3 Nil))) + length (Cons True (Cons False (Cons True Nil))) }