Created
June 12, 2017 17:36
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| data Const k a = Const k | |
| deriving (Eq, Show) | |
| instance Functor (Const k) where | |
| fmap _ (Const k) = Const k | |
| instance Monoid k => Applicative (Const k) where | |
| pure = const (Const mempty) | |
| _ <*> Const k = Const k | |
| instance Monoid k => Monad (Const k) where | |
| return = pure | |
| Const k >>= _ = Const k |
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