[GHC] #12479: build fail of commercialhaskell.com with stack build on mac os x sierra beta 4

[GHC]

#12479: build fail of commercialhaskell.com with stack build on mac os x sierra
beta 4
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        Reporter:  stephenb          |                Owner:
            Type:  bug               |               Status:  infoneeded
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  MacOS X           |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12198            |  Differential Rev(s):  Phab:D2532
       Wiki Page:                    |
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Comment (by darchon):

 Also, I'll be attending the hackathon on 8 and 9 October (after Haskell
 Exchange 2016), so if this problem isn't already fixed by that time, I
 volunteer to work on a patch during the hackathon. I won't have time to
 work on it on any other date or time.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12479#comment:25>
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