[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            |   Component:  libraries/pretty
     Version:  6.12.3            |    Keywords:                  
    Testcase:                    |   Blockedby:                  
          Os:  Unknown/Multiple  |    Blocking:                  
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
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Comment(by basvandijk):

 The deadline for this proposal has passed. There were no objections.

 Thomas Schilling asked if this patch will break existing packages on
 Hackage. I will try to find that out later today.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4378#comment:3>
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