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Evaluator
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-- Expressions
--------------
data Exp = Const Int
| Add Exp Exp
| Sub Exp Exp
| Mul Exp Exp
deriving Show
eval :: Exp -> Int
eval = undefined
-- Stack machine
----------------
data Inst = IPush Int
| IAdd
| ISub
| IMul
deriving Show
type Prog = [Inst]
type Stack = [Int]
run :: Stack -> Prog -> Stack
run = undefined
-- Expression Compiler
----------------------
compile :: Exp -> Prog
compile = undefined
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