[GHC] #7003: 'impossible' compile time error, when using `runStream'.

[GHC]

#7003: 'impossible' compile time error, when using `runStream'.
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 Reporter:  dbanas              |          Owner:          
     Type:  bug                 |         Status:  new     
 Priority:  normal              |      Component:  Compiler
  Version:  7.4.2               |       Keywords:          
       Os:  Linux               |   Architecture:  x86     
  Failure:  Compile-time crash  |       Testcase:          
Blockedby:                      |       Blocking:          
  Related:                      |  
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Comment(by guest):

 @dbananas: Please give source giving the error. Also the error says that's
 7.0.3; can you upgrade to 7.4.2 and see if it still happens?

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7003#comment:1>
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