[GHC] #4066: hSetEncoding only sets the encoding for the read side of a duplex Handle

[GHC]

#4066: hSetEncoding only sets the encoding for the read side of a duplex Handle
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    Reporter:  simonmar          |        Owner:  simonmar                   
        Type:  bug               |       Status:  new                        
    Priority:  high              |    Milestone:  6.12.3                     
   Component:  libraries/base    |      Version:  6.12.2                     
    Keywords:                    |   Difficulty:  Easy (less than 1 hour)    
          Os:  Unknown/Multiple  |     Testcase:                             
Architecture:  Unknown/Multiple  |      Failure:  Incorrect result at runtime
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 For example, calling `hSetEncoding` on a socket only works for reading,
 not writing.  Can be worked around by calling `socketToHandle` manually to
 create a `WriteMode` socket.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4066>
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