diff --git a/Auxiliary.hs b/Auxiliary.hs
new file mode 100644
index 0000000..cd844d7
--- /dev/null
+++ b/Auxiliary.hs
@@ -0,0 +1,5 @@
+
+module Auxiliary (module Auxiliary) where
+
+snoc :: a -> [a] -> [a]
+snoc x xs = xs ++ [x]
diff --git a/language.cabal b/language.cabal
index 3f4860c..52b2577 100644
--- a/language.cabal
+++ b/language.cabal
@@ -31,6 +31,7 @@ executable language
       Grammar.Print
       Grammar.Skel
       LambdaLifter
+      Auxiliary
       -- Interpreter
 
     hs-source-dirs:   src