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|
{-# LANGUAGE TemplateHaskell, TypeFamilies, PolyKinds, TypeApplications #-}
module ClosedFam2 where
import Language.Haskell.TH
$( return [ ClosedTypeFamilyD
(TypeFamilyHead
(mkName "Equals")
[ KindedTV (mkName "a") (VarT (mkName "k"))
, KindedTV (mkName "b") (VarT (mkName "k")) ]
( TyVarSig (KindedTV (mkName "r") (VarT (mkName "k"))))
Nothing)
[ TySynEqn Nothing
(AppT (AppT (ConT (mkName "Equals")) (VarT (mkName "a")))
(VarT (mkName "a")))
(ConT (mkName "Int"))
, TySynEqn Nothing
(AppT (AppT (ConT (mkName "Equals")) (VarT (mkName "a")))
(VarT (mkName "b")))
(ConT (mkName "Bool")) ] ])
a :: Equals b b
a = (5 :: Int)
b :: Equals Int Bool
b = False
$( return [ ClosedTypeFamilyD
(TypeFamilyHead
(mkName "Foo")
[ KindedTV (mkName "a") (VarT (mkName "k"))]
(KindSig StarT ) Nothing )
[ TySynEqn Nothing
(AppT (AppKindT (ConT (mkName "Foo")) StarT)
(VarT (mkName "a")))
(ConT (mkName "Int"))
, TySynEqn Nothing
(AppT (AppKindT (ConT (mkName "Foo")) (AppT (AppT ArrowT StarT) (StarT)))
(VarT (mkName "a")))
(ConT (mkName "Bool")) ] ])
c :: Foo Int
c = 5
d :: Foo Bool
d = 6
e :: Foo Maybe
e = False
|
