[GHC] #653: Changeable lexer/parser (like DynFlags.log_action)

[GHC]

#653: Changeable lexer/parser (like DynFlags.log_action)
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 Reporter:  Lemmih           |          Owner:                  
     Type:  feature request  |         Status:  new             
 Priority:  low              |      Milestone:  _|_             
Component:  Compiler         |        Version:  6.4.1           
 Severity:  normal           |     Resolution:                  
 Keywords:                   |     Difficulty:  Moderate (1 day)
 Testcase:  N/A              |   Architecture:  Multiple        
       Os:  Multiple         |  
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Changes (by igloo):

  * milestone:  => _|_

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/653>
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