[GHC] #2328: Compiling DoCon with 6.8.3 has 3x slow-down compared with 6.8.2

[GHC]

#2328: Compiling DoCon with 6.8.3 has 3x slow-down compared with 6.8.2
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 Reporter:  simonpj                       |          Owner:  simonpj
     Type:  compile-time performance bug  |         Status:  new    
 Priority:  high                          |      Milestone:  6.10.1 
Component:  Compiler                      |        Version:  6.8.2  
 Severity:  normal                        |     Resolution:         
 Keywords:                                |     Difficulty:  Unknown
 Testcase:                                |   Architecture:  Unknown
       Os:  Unknown                       |  
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Comment (by maeder):

 probably related to #955

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2328#comment:7>
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