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{-# LANGUAGE RankNTypes, PolyKinds, GADTs, TypeFamilies #-}
-- Multiline foralls are consistent across all declarations
data D =
forall
(f ::
* -> * -> *)
(x :: *)
(y :: *)
. D (f x y)
data G where
G :: forall
(f ::
* -> * -> *)
(x :: *)
(y :: *)
. f x y -> G
f :: forall
(f ::
* -> * -> *)
(x :: *)
(y :: *)
. f x y -> ()
f = const ()
type family T f x y where
forall
(f ::
* -> * -> *)
(x :: *)
(y :: *)
. T f x y = f x y
{-# RULES
"r"
forall
(f ::
* -> * -> *)
(x :: *)
(y :: *)
. r (a :: f x y) =
()
#-}
|
