[GHC] #3339: Data.Monoid: Add (+>) as a synonym for mappend

[GHC]

#3339: Data.Monoid: Add (+>) as a synonym for mappend
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 Reporter:  bos               |          Owner:                  
     Type:  bug               |         Status:  new             
 Priority:  normal            |      Milestone:                  
Component:  libraries/base    |        Version:  6.10.3          
 Severity:  normal            |     Resolution:                  
 Keywords:                    |       Testcase:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
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Comment (by ajd):

 What is wrong with generalizing the type of (++)? If it would not break
 too much code (on first glance, I'm not sure how it would), I think that
 that would be the best solution.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3339#comment:2>
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