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{-# LANGUAGE AllowAmbiguousTypes, TypeFamilies, TypeOperators #-}
import Data.Kind
import Data.Typeable
unsafeCoerce :: a -> b
unsafeCoerce x = case eqT :: Maybe (Type :~: Constraint) of
Nothing -> error "No more bug!"
Just r -> error "Bug!"
main :: IO ()
main = let x :: Int
x = 42
in print (unsafeCoerce x :: Double)
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