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{-# LANGUAGE Rank2Types #-}
-- !!! Local universal quantification.
module ShouldSucceed where
data Monad2 m = MkMonad2 (forall a. a -> m a)
(forall a b. m a -> (a -> m b) -> m b)
halfListMonad :: (forall a b. [a] -> (a -> [b]) -> [b]) -> Monad2 []
halfListMonad b = MkMonad2 (\x -> [x]) b
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