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deque-blog/dsl_arithmetic_3_expr.hs

Created January 21, 2017 15:40
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dsl_arithmetic_3_expr.hs
{-# LANGUAGE DeriveFunctor, DeriveFoldable, DeriveTraversable #-}
data OpType = Add | Mul deriving (Show, Eq, Ord)
data ExprR r
= Cst Int
| Var Id
| Op OpType [r]
deriving (Show, Eq, Ord, Functor, Foldable, Traversable)
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