[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:  6.6             
   Component:  Compiler         |      Version:  6.4.1           
    Severity:  normal           |     Keywords:                  
          Os:  Multiple         |   Difficulty:  Moderate (1 day)
Architecture:  Multiple         |  
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It would be very convenient for projects such as 'Haskell Server Pages' if
 the GHC library allowed the user to supply his own lexer and parser.

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