missing empty-Enumeration and out-of-range warning for `Natural`
GHCi, version 7.10.2: http://www.haskell.org/ghc/ :? for helpλ:2> :set -XNegativeLiterals λ:3> (-123) :: Word<interactive>:3:2: Warning: Literal -123 is out of the Word range 0..1844674407370955161518446744073709551493it :: Wordλ:4> (-123) :: Numeric.Natural.Natural*** Exception: arithmetic underflowλ:5>λ:6> [10..3] :: [Word]<interactive>:6:1: Warning: Enumeration is empty[]it :: [Word]λ:7> [10..3] :: [Numeric.Natural.Natural][]it :: [GHC.Natural.Natural]