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{-# LANGUAGE
QuantifiedConstraints
, StandaloneKindSignatures
, TypeOperators
, GADTs
, ConstraintKinds
, RankNTypes
, UndecidableInstances
, ImpredicativeTypes
#-}
module Typelevel.Constraint.Repro where
import Data.Kind (Constraint, Type)
type Dict :: Constraint -> Type
data Dict c
where
Dict :: c => Dict c
type (⇒) :: Constraint -> Constraint -> Constraint
type c ⇒ d = c => d
infixr 0 ⇒
type (\/) :: Constraint -> Constraint -> Constraint
type a \/ b = (forall r. (a ⇒ r, b ⇒ r) ⇒ r)
infixr 5 \/
dict :: Dict ((x \/ y) \/ z ⇒ x \/ y \/ z)
dict = Dict
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