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+definition module ABC.CStack
+
+from ABC.Def import ::InstrId
+
+:: CSrc :== Int
+:: CDst :== Int
+:: CStack (:== [InstrId])
+
+cs_init :: CStack
+cs_get :: CSrc CStack -> InstrId
+cs_popn :: CSrc CStack -> CStack
+cs_push :: InstrId CStack -> CStack