[GHC] #4149: Make Permissions type abstract

[GHC]

#4149: Make Permissions type abstract
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    Reporter:  igloo                |        Owner:              
        Type:  proposal             |       Status:  new         
    Priority:  normal               |    Milestone:  Not GHC     
   Component:  libraries/directory  |      Version:  6.12.3      
    Keywords:                       |   Difficulty:              
          Os:  Unknown/Multiple     |     Testcase:              
Architecture:  Unknown/Multiple     |      Failure:  None/Unknown
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Comment(by igloo):

 Thread starts here:
 http://www.haskell.org/pipermail/libraries/2010-June/013757.html

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4149#comment:1>
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