[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            |      Component:  libraries/base  
  Version:  7.5               |       Keywords:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown      |       Testcase:                  
Blockedby:                    |       Blocking:                  
  Related:                    |  
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 Don't know how this can _not_ exist.

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