[GHC] #10929: Enumeration-empty warning not firing for `[Integer]`

[GHC]

#10929: Enumeration-empty warning not firing for `[Integer]`
-------------------------------------+-------------------------------------
           Reporter:  hvr            |             Owner:
               Type:  bug            |            Status:  new
           Priority:  low            |         Milestone:  8.0.1
          Component:  Compiler       |           Version:  7.10.2
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |
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 {{{
 GHCi, version 7.10.2: http://www.haskell.org/ghc/  :? for help
 λ:2> [10..4] :: [Integer]
 []
 it :: [Integer]


 λ:3> [10..4] :: [Int]
 <interactive>:3:1: Warning: Enumeration is empty
 []
 it :: [Int]


 λ:4> [10..4] :: [Word]
 <interactive>:4:1: Warning: Enumeration is empty
 []
 it :: [Word]
 }}}

 (Trivial to fix, patch following shortly)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10929>
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