Reword code types

VL1.tex

@@ -692,10 +692,10 @@ For haskell IDEs, see \url{https://wiki.haskell.org/IDEs}
 Does this compile? If not, fix it. Is this a total function?
 \setHaskellCodeStyle
 \begin{lstlisting}
-data FakeInt = MkDouble Double
-             | MkInt Int
+data IntOrDouble = MkDouble Double
+                 | MkInt Int
 
-f :: Int -> FakeInt
+f :: Int -> IntOrDouble
 f 0 = 0.5
 \end{lstlisting}
 \end{frame}