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{-# LANGUAGE DeriveAnyClass #-}
{-# LANGUAGE DerivingVia #-}
{-# LANGUAGE ExplicitForAll #-}
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE StandaloneDeriving #-}
module T18240b where
import Data.Proxy
data T a b
class W x y z
instance W x y (T a b)
newtype Foo a b = MkFoo (T a b)
deriving via (forall x. T x y) instance W x y (Foo a b)
deriving via forall x. forall y. T x y instance W x y (Foo a b)
deriving via forall x. (forall y. T x y) instance W x y (Foo a b)
class C1 x
class C2 x y z
data Bar = MkBar
deriving anyclass ( C1
, (forall x. C2 x y)
, forall x. forall y. C2 x y
, forall x. (forall y. C2 x y)
)
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