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{-# LANGUAGE DerivingVia #-}
{-# LANGUAGE ScopedTypeVariables #-}
{-# LANGUAGE StandaloneDeriving #-}
module DerivingViaFail where
import Control.Category
import Data.Functor.Identity
newtype Foo1 a = Foo1 a deriving Show via (Identity b)
newtype Foo2 a b = Foo2 (a -> b)
deriving Category
via fooo
data Foo3 deriving Eq via (forall a. a)
newtype Foo4 a = Foo4 a
deriving via (Identity b)
instance Show (Foo4 a)
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