[GHC] #1901: 6.8.1 incorrectly infers contexts from pattern matches.

[GHC]

#1901: 6.8.1 incorrectly infers contexts from pattern matches.
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 Reporter:  guest     |          Owner:  igloo  
     Type:  merge     |         Status:  new    
 Priority:  normal    |      Milestone:         
Component:  Compiler  |        Version:  6.8.1  
 Severity:  normal    |     Resolution:         
 Keywords:            |     Difficulty:  Unknown
 Testcase:            |   Architecture:  Unknown
       Os:  Unknown   |  
----------------------+-----------------------------------------------------
Changes (by simonpj):

  * status:  reopened => new
  * owner:  => igloo

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1901#comment:4>
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