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|
{-# LANGUAGE FlexibleInstances #-}
{-# LANGUAGE GeneralizedNewtypeDeriving #-}
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE TypeFamilies #-}
{-# LANGUAGE UndecidableInstances #-}
module T8165 where
-----------------------------------------------------------
class C a where
type T a
instance C Int where
type T Int = Bool
newtype NT = NT Int
deriving C
-----------------------------------------------------------
class D a where
type U a
instance D Int where
type U Int = Int
newtype E = MkE Int
deriving D
-----------------------------------------------------------
class C2 a b where
type F b c a :: *
type G b (d :: * -> *) :: * -> *
instance C2 a y => C2 a (Either x y) where
type F (Either x y) c a = F y c a
type G (Either x y) d = G y d
newtype N a = MkN (Either Int a)
deriving (C2 x)
-----------------------------------------------------------
class HasRing a where
type Ring a
newtype L2Norm a = L2Norm a
deriving HasRing
newtype L1Norm a = L1Norm a
deriving HasRing
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