[GHC] #15662: Line pragmas appear to be slightly broken with Clang's CPP

[GHC]

#15662: Line pragmas appear to be slightly broken with Clang's CPP
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.4.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 This appears to be fixed in Xcode 10.1 and macOS 10.14.2. It's not
 entirely clear how we should handle the broken annotation now.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15662#comment:1>
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