[GHC] #5448: GHC stuck in infinite loop compiling with optimizations

[GHC]

#5448: GHC stuck in infinite loop compiling with optimizations
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  Reporter:  ronwalf             |          Owner:                
      Type:  bug                 |         Status:  new           
  Priority:  normal              |      Milestone:  _|_           
 Component:  Compiler            |        Version:  7.0.3         
Resolution:                      |       Keywords:                
        Os:  MacOS X             |   Architecture:  x86_64 (amd64)
   Failure:  Compile-time crash  |     Difficulty:  Unknown       
  Testcase:                      |      Blockedby:                
  Blocking:                      |        Related:                
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Changes (by simonpj):

  * difficulty:  => Unknown


Comment:

 Here is another, even simpler, example of a class with a contra-variant
 occurence of itself: #5722.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5448#comment:7>
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