[GHC] #5781: Add Data.List.at :: [a] -> Int -> Maybe a

[GHC]

#5781: Add Data.List.at :: [a] -> Int -> Maybe a
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    Reporter:  nh2               |       Owner:                  
        Type:  feature request   |      Status:  new             
    Priority:  normal            |   Milestone:                  
   Component:  libraries/base    |     Version:  7.5             
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:                    |  
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Comment(by nh2):

 No, (!!) is :: [a] -> Int -> a and errors on an index out of range.

 I am looking for its safe version, [a] -> Int -> Maybe a.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5781#comment:2>
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