[GHC] #721: Write Data.Trie

[GHC]

#721: Write Data.Trie
----------------------------+-----------------------------------------------
 Reporter:  jpbernardy      |          Owner:  jpbernardy
     Type:  task            |         Status:  new       
 Priority:  normal          |      Milestone:  6.8       
Component:  libraries/base  |        Version:  6.4.1     
 Severity:  normal          |     Resolution:            
 Keywords:  collections     |     Difficulty:  Unknown   
 Testcase:  N/A             |   Architecture:  Unknown   
       Os:  Unknown         |  
----------------------------+-----------------------------------------------
Changes (by igloo):

  * milestone:  => 6.8
  * testcase:  => N/A

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/721>
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