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+definition module ABC.AStack
+
+from ABC.Def import ::NodeId, ::NrArgs
+
+:: ASrc :== Int
+:: ADst :== Int
+:: AStack (:== [NodeId])
+
+as_get :: ASrc AStack -> NodeId
+as_init :: AStack
+as_popn :: NrArgs AStack -> AStack
+as_push :: NodeId AStack -> AStack
+as_pushn :: [NodeId] AStack -> AStack
+as_topn :: NrArgs AStack -> [NodeId]
+as_update :: ADst NodeId AStack -> AStack