[GHC] #4836: literate markdown not handled correctly by unlit

[GHC]

#4836: literate markdown not handled correctly by unlit
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        Reporter:  guest                      |            Owner:
            Type:  bug                        |           Status:  new
        Priority:  low                        |        Milestone:  7.6.2
       Component:  Compiler                   |          Version:  7.0.1
      Resolution:                             |         Keywords:
Operating System:  Unknown/Multiple           |     Architecture:
 Type of failure:  GHC rejects valid program  |  Unknown/Multiple
       Test Case:                             |       Difficulty:  Unknown
        Blocking:                             |       Blocked By:
                                              |  Related Tickets:  #7120
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Comment (by elliottt):

 I've updated my branch, and it's building successfully against master.  I
 plan on testing a few corner cases, then submitting a patch.  For
 reference, here's the branch:

  https://github.com/elliottt/ghc/tree/literate-markdown

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4836#comment:13>
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