[GHC] #2531: Prune duplicates in ghci history

[GHC]

#2531: Prune duplicates in ghci history
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    Reporter:  venkat           |       Owner:         
        Type:  feature request  |      Status:  new    
    Priority:  normal           |   Component:  GHCi   
     Version:  6.8.3            |    Severity:  normal 
    Keywords:                   |    Testcase:         
Architecture:  Unknown          |          Os:  Unknown
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 When we enter the same expressions in ghci, all of them go in to history.
 It'd be useful to have an option to eliminate duplicate expressions before
 storing them in ghci history.

 We can also consider doing this for storing ghci history as a file.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2531>
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