[GHC] #15095: pretty-show's literate haskell Setup.lhs failed on 32-bit windows

[GHC]

#15095: pretty-show's literate haskell Setup.lhs failed on 32-bit windows
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        Reporter:  simonmic          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.2
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:  x86
 Type of failure:  GHC rejects       |            Test Case:
  valid program                      |
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Phyx-):

 I can't reproduce it, I've seen such reports before for `AppVeyor`. My
 guess is something is on their environment interfering with `unlit`.

 I'd need a core dump or memory dump to be able to figure it out.

 AppVeyor has gdb, so a core dump from gdb or procdump would suffice.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15095#comment:3>
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