[GHC] #2531: Prune duplicates in ghci history

[GHC]

#2531: Prune duplicates in ghci history
-------------------------------------+-------------------------------------
        Reporter:  venkat            |                   Owner:
            Type:  feature request   |                  Status:  new
        Priority:  lowest            |               Milestone:  7.12.1
       Component:  GHCi              |                 Version:  6.8.3
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by Thomas Miedema <thomasmiedema@…>):

 In [changeset:"b5a2e8763fcf0e2b4c57e12f2b2e5817e5ce9df0/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="b5a2e8763fcf0e2b4c57e12f2b2e5817e5ce9df0"
 Documentation: add section on .haskeline file (#2531)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/2531#comment:17>
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