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{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE FlexibleInstances #-}
module T10340 where
import GHC.Exts (Any)
class MonadState s m where
get :: m s
newtype State s a = State (s -> (s, a))
instance MonadState s (State s) where
get = State $ \s -> (s, s)
foo :: State Any Any
foo = get
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