[haskell-platform] #41: Upgrade happy for 2009.2.1

[haskell-platform]

#41: Upgrade happy for 2009.2.1
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 Reporter:  dons    |       Owner:  dons    
     Type:  defect  |      Status:  new     
 Priority:  major   |   Milestone:  2009.2.1
Component:  happy   |    Keywords:          
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 happy version 1.18.4 is on hackage. We should upgrade this (assume to be
 functionally compatible) for the 2009.2.1 release.

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Ticket URL: <http://trac.haskell.org/haskell-platform/ticket/41>
haskell-platform <http://trac.haskell.org/haskell-platform>
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