[Haddock] [haddock] #140: Support for doctest style usage blocks

[haddock]

#140: Support for doctest style usage blocks
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Reporter:  ezyang       |        Owner:       
    Type:  enhancement  |       Status:  new  
Priority:  major        |    Milestone:  2.8.0
 Version:  2.6.0        |   Resolution:       
Keywords:               |  
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Comment (by simonmar):

 `repl>` would look a bit weird if you didn't know what it stood for, and
 if you know what it stands for then it's clutter.  Why not choose a
 generic prompt symbol, e.g. `>>>`, `-->`, or something?

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Ticket URL: <http://trac.haskell.org/haddock/ticket/140#comment:6>
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