[GHC] #13107: Negative literal equal to minBound gives a spurious warning

[GHC]

#13107: Negative literal equal to minBound gives a spurious warning
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        Reporter:  erikd             |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by erikd):

 I can avoid the warning if I use the `NegativeLiterals` language pragma.

 Maybe that language pragma should be a candidate for inclusion as a
 default for the next haskell language standard.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13107#comment:1>
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