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{-# LANGUAGE TemplateHaskell, TypeFamilyDependencies, PolyKinds #-}
module T8884 where
import Language.Haskell.TH
import System.IO
type family Foo a = r | r -> a where
Foo x = x
type family Baz (a :: k) = (r :: k) | r -> a
type instance Baz x = x
$( do FamilyI foo@(ClosedTypeFamilyD (TypeFamilyHead _ tvbs1 res1 m_kind1)
[TySynEqn (Just bndrs1) (AppT _ lhs1) rhs1])
[] <- reify ''Foo
FamilyI baz@(OpenTypeFamilyD (TypeFamilyHead _ tvbs2 res2 m_kind2))
[inst@(TySynInstD (TySynEqn (Just bndrs2) (AppT _ lhs2) rhs2))] <- reify ''Baz
runIO $ putStrLn $ pprint foo
runIO $ putStrLn $ pprint baz
runIO $ putStrLn $ pprint inst
runIO $ hFlush stdout
return [ ClosedTypeFamilyD
(TypeFamilyHead (mkName "Foo'") tvbs1 res1 m_kind1)
[TySynEqn (Just bndrs1) (AppT (ConT (mkName "Foo'")) lhs1) rhs1]
, OpenTypeFamilyD
(TypeFamilyHead (mkName "Baz'") tvbs2 res2 m_kind2)
, TySynInstD (TySynEqn (Just bndrs2) (AppT (ConT (mkName "Baz'")) lhs2) rhs2)] )
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