[GHC] #13170: Core Lint error on git HEAD

[GHC]

#13170: Core Lint error on git HEAD
-------------------------------------+-------------------------------------
        Reporter:  dobenour          |                Owner:  rwbarton
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  simplCore/should_compile/T13170
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D3008
       Wiki Page:                    |
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Comment (by rwbarton):

 Incidentally, the failure in
 {{{#!hs
     isSigIntQuit n = sig == sigINT || sig == sigQUIT
       where
         sig = fromIntegral (-n)
 }}}
 only showed up on a 32-bit system because `sig :: CInt` is 32 bits, and so
 on a 64-bit system there is also a `GHC.Prim.narrow32Int#` in the case
 scrutinee (from the implementation of `negate` for `CInt`).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13170#comment:4>
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