[GHC] #7430: GHC API reports CPP errors in confusing ways

[GHC]

#7430: GHC API reports CPP errors in confusing ways
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        Reporter:  MikolajKonarski   |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  GHC API           |                 Version:  7.6.1
      Resolution:                    |                Keywords:
Operating System:  Linux             |            Architecture:
 Type of failure:  Other             |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |                Blocking:
                                     |  Differential Revisions:
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Comment (by ezyang):

 Should be possible to construct a small example?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7430#comment:6>
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