shithub: MicroHs

ref: fff0643c60f727c5eca1ec255e4bc7a22203fc25
dir: /lib/Data/Either.hs/

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-- Copyright 2023 Lennart Augustsson
-- See LICENSE file for full license.
module Data.Either(module Data.Either) where
import Primitives
import Data.Bool
import Data.Eq

data Either a b = Left a | Right b

instance forall a b . (Eq a, Eq b) => Eq (Either a b) where
  Left  a == Left  a'  =  a == a'
  Right b == Right b'  =  b == b'
  _       == _         =  False

either :: forall a b r . (a -> r) -> (b -> r) -> Either a b -> r
either f _ (Left  a) = f a
either _ f (Right b) = f b