[Hugs] #76: Add pattern guards

[Hugs]

#76: Add pattern guards
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 Reporter:  neil         |       Owner:  nobody
     Type:  enhancement  |      Status:  new   
 Priority:  minor        |   Milestone:        
Component:  hugs         |     Version:  200609
 Keywords:               |  
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Yhc, nhc and GHC all support pattern guards. It would be lovely if Hugs
 did as well, since they are incredibly handy. The absence of pattern
 guards means that Hugs cannot compile the central StackSet module in
 XMonad, amongst other things.

 http://research.microsoft.com/Users/simonpj/Haskell/guards.html

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Ticket URL: <http://hackage.haskell.org/trac/hugs/ticket/76>
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