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{-# language MagicHash, UnboxedTuples #-}
import GHC.Num.Natural
import GHC.Num.BigNat
import GHC.Exts
main = print $ map naturalCheck [0, 1, maxWord, maxWord + 1, invalid]
where
maxWord = fromIntegral (maxBound :: Word)
invalid = NB (bigNatOne# (# #)) -- 1 would fit into the NS constructor.
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