[GHC] #5022: GHC goes to infinite loop

[GHC]

#5022: GHC goes to infinite loop
-------------------------------+--------------------------------------------
    Reporter:  serpentologist  |       Owner:               
        Type:  bug             |      Status:  new          
    Priority:  normal          |   Component:  Compiler     
     Version:  7.0.2           |    Keywords:  infinite loop
    Testcase:                  |   Blockedby:               
          Os:  Linux           |    Blocking:               
Architecture:  x86             |     Failure:  None/Unknown 
-------------------------------+--------------------------------------------

Comment(by serpentologist):

 I was told in LiveJournal community that the problem might be caused by
 pSwitch function, specifically by 'forall' usage. So i removed it along
 with the renderFS function dependent on it and compilation succeeded.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5022#comment:1>
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