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{-# LANGUAGE GADTs, KindSignatures, PatternSynonyms, FlexibleContexts #-}
module ShouldCompile where
import Data.Kind (Type)
data X :: (Type -> Type) -> Type -> Type where
Y :: (Show a) => f a -> X f (Maybe a)
pattern C :: (Show (a, Bool)) => a -> X Maybe (Maybe (a, Bool))
pattern C x = Y (Just (x, True))
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