[haddock] #83: Better parse error messages when parsing the contents of Haddock comments

[haddock]

#83: Better parse error messages when parsing the contents of Haddock comments
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 Reporter:  waern  |       Type:  defect
   Status:  new    |   Priority:  major 
Milestone:  2.6.0  |    Version:  2.4.1 
 Keywords:         |  
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 Needs to be done in GHC.

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Ticket URL: <http://trac.haskell.org/haddock/ticket/83>
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