[GHC] #4321: Unexpected stack overflow prevented by superfluous type annotation

[GHC]

#4321: Unexpected stack overflow prevented by superfluous type annotation
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  Reporter:  bjpop         |          Owner:                  
      Type:  bug           |         Status:  new             
  Priority:  normal        |      Milestone:                  
 Component:  Compiler      |        Version:  6.13            
Resolution:                |       Keywords:                  
  Testcase:  T4321         |      Blockedby:                  
Difficulty:                |             Os:  Unknown/Multiple
  Blocking:                |   Architecture:  Unknown/Multiple
   Failure:  None/Unknown  |  
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Comment(by simonpj):

 Ian, I guess you added the expected result?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4321#comment:4>
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