[GHC] #4378: Add IsString and Monoid instances for Doc

[GHC]

#4378: Add IsString and Monoid instances for Doc
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    Reporter:  basvandijk        |        Owner:              
        Type:  proposal          |       Status:  patch       
    Priority:  normal            |    Milestone:  Not GHC     
   Component:  libraries/pretty  |      Version:  6.12.3      
    Keywords:                    |     Testcase:              
   Blockedby:                    |   Difficulty:              
          Os:  Unknown/Multiple  |     Blocking:              
Architecture:  Unknown/Multiple  |      Failure:  None/Unknown
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Comment(by duncan):

 http://www.haskell.org/pipermail/libraries/2010-November/015070.html

 Bas did an analysis and things look ok. The patch should be applied.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4378#comment:5>
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