[GHC] #5943: Code without MVar: "thread blocked indefinitely in an MVar operation"

[GHC]

#5943: Code without MVar: "thread blocked indefinitely in an MVar operation"
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 Reporter:  cobb          |          Owner:                  
     Type:  bug           |         Status:  new             
 Priority:  normal        |      Component:  Compiler        
  Version:  7.4.1         |       Keywords:                  
       Os:  Linux         |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown  |       Testcase:                  
Blockedby:                |       Blocking:                  
  Related:                |  
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 The attached code produces the above message when compiled with
 optimisations on - even -O1 is enough. The same happens on both 32 and
 64-bit architectures.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5943>
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