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deque-blog/dsl_arithmetic_1_prn.hs

Created January 16, 2017 20:00
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dsl_arithmetic_1_prn.hs
prn :: Expr -> String
prn (Cst n) = show n
prn (Var v) = v
prn (Op Add xs) = "(+ " ++ unwords (map prn xs) ++ ")"
prn (Op Mul xs) = "(* " ++ unwords (map prn xs) ++ ")"
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