[GHC] #7887: panic when playing with pipes

[GHC]

#7887: panic when playing with pipes
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Reporter:  bfr               |          Owner:                  
    Type:  bug               |         Status:  new             
Priority:  normal            |      Component:  Compiler        
 Version:  7.6.3             |       Keywords:                  
      Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
 Failure:  None/Unknown      |      Blockedby:                  
Blocking:                    |        Related:                  
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Comment(by bfr):

 Note: I used -f-defer-type-errors, but the bug happens without that flag,
 too (and without the two type warnings).

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7887#comment:2>
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