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diff --git a/ABC/AStack.icl b/ABC/AStack.icl
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+implementation module ABC.AStack
+
+import StdEnv
+
+import ABC.Def
+import ABC.Misc
+
+:: AStack :== [NodeId]
+
+instance toString AStack where toString xs = "[" <++ (",", xs) <+ "]"
+
+as_get    :: ASrc AStack -> NodeId
+as_get _ []    = abortn "as_get: index too large"
+as_get 0 [n:_] = n
+as_get i [_:s] = as_get (i-1) s
+
+as_init   :: AStack
+as_init = []
+
+as_popn   :: NrArgs AStack -> AStack
+as_popn 0 s     = s
+as_popn _ []    = abortn "as_popn: popping too many elements"
+as_popn i [_:s] = as_popn (i-1) s
+
+as_push   :: NodeId AStack -> AStack
+as_push n s = [n:s]
+
+as_pushn  :: [NodeId] AStack -> AStack
+as_pushn is s = is ++ s
+
+as_topn   :: NrArgs AStack -> [NodeId]
+as_topn i s = topn [] i s
+where
+	topn :: [NodeId] NrArgs AStack -> [NodeId]
+	topn ns 0 _     = ns
+	topn _ i []     = abortn "as_topn: taking too many elements"
+	topn ns i [n:s] = topn (ns ++ [n]) (i-1) s
+
+as_update :: ADst NodeId AStack -> AStack
+as_update 0 n [_:s] = [n:s]
+as_update _ _ []    = abortn "as_update: index too large"
+as_update i n [m:s] = [m:as_update (i-1) n s]