[GHC] #5958: Follow mtl upstream

[GHC]

#5958: Follow mtl upstream
---------------------------------+------------------------------------------
    Reporter:  igloo             |       Owner:                  
        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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 As per http://projects.haskell.org/pipermail/haskell-
 platform/2012-March/001760.html we should be tracking
 https://github.com/ekmett/mtl.git (which may mean asking upstream to merge
 our patches, if we have any) and will also need to track
 http://code.haskell.org/~ross/transformers

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