[GHC] #665: re-work of insert API

[GHC]

#665: re-work of insert API
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  Reporter:  jpbernardy            |          Owner:         
      Type:  feature request       |         Status:  new    
  Priority:  normal                |      Milestone:         
 Component:  libraries/base        |        Version:  6.4.1  
  Severity:  normal                |     Resolution:         
  Keywords:  Data Map collections  |             Os:  Unknown
Difficulty:  Unknown               |   Architecture:  Unknown
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Comment (by jpbernardy):

 I've decided to provide the more general update function
 {{{
     update :: (Maybe a -> Maybe a) -> k -> c -> c
 }}}

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/665>
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