[GHC] #1816: Add Data.Set.mapMaybe

[GHC]

#1816: Add Data.Set.mapMaybe
-------------------------------+--------------------------------------------
  Reporter:  guest             |          Owner:  fox@…           
      Type:  proposal          |         Status:  new             
  Priority:  normal            |      Milestone:  7.6.1           
 Component:  libraries/base    |        Version:                  
Resolution:                    |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown      |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------
Changes (by igloo):

 * cc: johan.tibell@… (added)
  * owner:  => fox@…
  * milestone:  Not GHC => 7.6.1


Comment:

 Milan, Johan, can you take a look please?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1816#comment:6>
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