[GHC] #5958: Follow mtl upstream

[GHC]

#5958: Follow mtl upstream
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    Reporter:  igloo             |       Owner:  igloo           
        Type:  task              |      Status:  new             
    Priority:  high              |   Milestone:  7.6.1           
   Component:  Build System      |     Version:  7.4.1           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by simonpj):

 Do the reverse for Hoopl: make GHC's repo the master.  (Check with
 Norman.)

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5958#comment:2>
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