[GHC] #13697: Teach GHCi to deduplicate history

[GHC]

#13697: Teach GHCi to deduplicate history
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        Reporter:  bgamari           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 Ahh, indeed, it seems that I, long ago in a place far far away, added this
 incantation to my `bashrc`,
 {{{#!bash
 export HISTCONTROL=ignoredups ignorespace
 }}}
 I suspect this is responsible.

 In this case we may want to keep Haskeline's current behavior as-is, but
 it would be nice if `~/.haskeline` would have a similar option.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13697#comment:7>
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