T17296.hs

{-# LANGUAGE DataKinds #-}
{-# LANGUAGE GADTs #-}
{-# LANGUAGE PolyKinds #-}
{-# LANGUAGE TemplateHaskell #-}
{-# LANGUAGE TypeFamilies #-}
module T17296 where

import Data.Foldable
import Data.Kind
import Language.Haskell.TH hiding (Type)
import System.IO

data family   Foo1 :: Type -> Type
data instance Foo1 Bool = Foo1Bool
data instance Foo1 (Maybe a)

data family   Foo2 :: k -> Type
data instance Foo2 Bool = Foo2Bool
data instance Foo2 (Maybe a)
data instance Foo2 :: Char -> Type
data instance Foo2 :: (Char -> Char) -> Type where

data family   Foo3 :: k
data instance Foo3
data instance Foo3 Bool = Foo3Bool
data instance Foo3 (Maybe a)
data instance Foo3 :: Char -> Type
data instance Foo3 :: (Char -> Char) -> Type where

$(do let test :: Name -> Q ()
         test n = do i <- reify n
                     runIO $ do hPutStrLn stderr $ pprint i
                                hPutStrLn stderr ""
                                hFlush stderr

     traverse_ test [''Foo1, ''Foo2, ''Foo3]
     pure [])