[GHC] #9594: Cleanup of filepath package

[GHC]

#9594: Cleanup of filepath package
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              Reporter:  thomie      |            Owner:
                  Type:  task        |           Status:  patch
              Priority:  normal      |        Milestone:
             Component:  libraries   |          Version:  7.9
  (other)                            |         Keywords:  filepath
            Resolution:              |     Architecture:  Unknown/Multiple
      Operating System:              |       Difficulty:  Unknown
  Unknown/Multiple                   |       Blocked By:
       Type of failure:              |  Related Tickets:  #8752
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by hvr):

 please feel free to submit that as a pull-request to the
 `haskell/filepath` (even though it says "dont use yet") so we can start
 code-reviewing :-)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9594#comment:2>
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