[GHC] #3811: Parse errors should display text being parsed

[GHC]

#3811: Parse errors should display text being parsed
--------------------------------+-------------------------------------------
  Reporter:  asuffield          |          Owner:  igloo           
      Type:  bug                |         Status:  closed          
  Priority:  normal             |      Milestone:  6.14.1          
 Component:  Compiler (Parser)  |        Version:  6.12.1          
Resolution:  fixed              |       Keywords:                  
  Testcase:  T3811*             |      Blockedby:                  
Difficulty:                     |             Os:  Unknown/Multiple
  Blocking:                     |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown       |  
--------------------------------+-------------------------------------------
Changes (by igloo):

  * status:  new => closed
  * testcase:  => T3811*
  * resolution:  => fixed


Comment:

 I've added more info to the parse errors in `RdrHsSyn`.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3811#comment:4>
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