[GHC] #667: Efficient Map <-> Set conversions

[GHC]

#667: Efficient Map <-> Set conversions
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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 Set collections  |             Os:  Unknown
Difficulty:  Unknown                   |   Architecture:  Unknown
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Comment (by jpbernardy):

 This requires to move the tree structures to another module, so Set and
 Map can both see the structure.

 Providing, toTree and "unsafeFromTree" would allow the user to implement
 his own algorithms.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/667>
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