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{-# Language CPP #-}
{-# Language QuantifiedConstraints #-}
{-# Language TypeApplications #-}
{-# Language PolyKinds #-}
{-# Language TypeOperators #-}
{-# Language DataKinds #-}
{-# Language TypeFamilies #-}
{-# Language TypeSynonymInstances #-}
{-# Language FlexibleInstances #-}
{-# Language GADTs #-}
{-# Language UndecidableInstances #-}
{-# Language MultiParamTypeClasses #-}
{-# Language FlexibleContexts #-}
module Bug where
import Data.Coerce
import Data.Kind
type Cat ob = ob -> ob -> Type
type Obj = Type
class Coercible (op_a --> b) (b <-- op_a) => (op_a -#- b)
instance Coercible (op_a --> b) (b <-- op_a) => (op_a -#- b)
class (forall (op_a :: obj) (b :: obj). op_a -#- b) => OpOpNoOp obj
instance (forall (op_a :: obj) (b :: obj). op_a -#- b) => OpOpNoOp obj
class
Ríki (obj :: Obj) where
type (-->) :: obj -> obj -> Type
ið :: a --> (a::obj)
class
OpOpNoOp obj
=>
OpRíki (obj :: Obj) where
type (<--) :: obj -> obj -> Type
data Op a = Op a
type family UnOp op where UnOp ('Op obj) = obj
newtype Y :: Cat (Op a) where
Y :: (UnOp b --> UnOp a) -> Y a b
instance Ríki Type where
type (-->) = (->)
ið x = x
instance OpRíki (Op Type) where
type (<--) @(Op Type) = Y @Type
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