[GHC] #595: Overhaul GHC's overlapping/non-exhaustive pattern checking

[GHC]

#595: Overhaul GHC's overlapping/non-exhaustive pattern checking
----------------------+-----------------------------------------------------
 Reporter:  simonmar  |          Owner:                    
     Type:  task      |         Status:  new               
 Priority:  normal    |      Milestone:  _|_               
Component:  Compiler  |        Version:  None              
 Severity:  normal    |     Resolution:  None              
 Keywords:  warnings  |     Difficulty:  Difficult (1 week)
 Testcase:  N/A       |   Architecture:  Unknown           
       Os:  Unknown   |  
----------------------+-----------------------------------------------------
Changes (by igloo):

  * milestone:  => _|_
  * keywords:  => warnings
  * testcase:  => N/A

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/595>
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