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{-# LANGUAGE GADTs #-}
{-# OPTIONS_GHC -fwarn-incomplete-patterns #-}
module T4139 where
data F a where
FInt :: F Int
FBool :: F Bool
class Baz a where
baz :: F a -> G a
instance Baz Int where
baz _ = GInt
instance Baz Bool where
baz _ = GBool
data G a where
GInt :: G Int
GBool :: G Bool
bar :: Baz a => F a -> ()
bar a@(FInt) =
case baz a of
GInt -> ()
-- GBool -> ()
bar _ = ()
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