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|
{-# LANGUAGE TypeFamilies #-}
module T10891 where
import Language.Haskell.TH
import System.IO
class C a where
f :: a -> Int
class C' a where
type F a :: *
type F a = a
f' :: a -> Int
class C'' a where
data Fd a :: *
instance C' Int where
type F Int = Bool
f' = id
instance C'' Int where
data Fd Int = B Bool | C Char
$(return [])
test :: ()
test =
$(let
display :: Name -> Q ()
display q = do
i <- reify q
runIO (hPutStrLn stderr (pprint i) >> hFlush stderr)
in do
display ''C
display ''C'
display ''C''
[| () |])
|
