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|
{-# Language GADTs #-}
module T14098 where
data App f a where
App :: f a -> App f (Maybe a)
data Ty a where
TBool :: Ty Bool
TInt :: Ty Int
data T f a where
C :: T Ty (Maybe Bool)
f1 :: T f a -> App f a -> ()
f1 C (App TBool) = ()
f2 :: T f a -> App f a -> ()
f2 C (App x)
| TBool <- x
= ()
g :: T f a -> App f a -> ()
g C (App x) = case x of
TBool -> ()
|
