[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 JulesBean):

 I think it's useful for Endo a, where you sometimes want to postcompose
 and sometimes precompose functions.

 I think it's useful for any monoid which represents something like the
 composition of a graphical image, where precomposition is putting
 something 'underneath' and postcomposition is putting something 'on top'.

 I suspect you quite often get Monoids along those general lines in DSLs;
 I've certainly seen a view.

 Of course the case for a special flipped operator can never be that
 strong; you can always just write an expression the other way around.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3339#comment:7>
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