missing empty-Enumeration and out-of-range warning for `Natural`
GHCi, version 7.10.2: http://www.haskell.org/ghc/ :? for help
λ:2> :set -XNegativeLiterals
λ:3> (-123) :: Word
<interactive>:3:2: Warning: Literal -123 is out of the Word range 0..18446744073709551615
18446744073709551493
it :: Word
λ:4> (-123) :: Numeric.Natural.Natural
*** Exception: arithmetic underflow
λ: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]