[GHC] #8412: TH allows negative type-level integers

[GHC]

#8412: TH allows negative type-level integers
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        Reporter:  monoidal          |            Owner:
            Type:  bug               |           Status:  patch
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  GHC accepts       |       Difficulty:  Easy (less than 1
  invalid program                    |  hour)
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by thoughtpolice):

 Krzysztof, this patch looks good to me. Feel free to merge when you have
 time.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8412#comment:2>
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