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deque-blog/dsl_arithmetic_2_functor.hs

Created January 20, 2017 20:08
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dsl_arithmetic_2_functor.hs
instance Functor ExprR where
fmap _ (Cst c) = Cst c
fmap _ (Var v) = Var v
fmap f (Op opType xs) = Op opType (map f xs)
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