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{-# LANGUAGE RankNTypes, TypeFamilies #-}
module T9404b where
type family ListTF x where
ListTF x = [x]
bar :: (forall x. ListTF x -> Int) -> ()
bar _ = ()
myconst :: ((forall r. ListTF r -> Int) -> ()) -> x -> (forall r. ListTF r -> Int) -> ()
myconst x _ = x
foo = (bar `myconst` ()) $ length
foo2 = (myconst bar ()) $ length
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