[GHC] #4342: Review containers changes

[GHC]

#4342: Review containers changes
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    Reporter:  igloo              |        Owner:              
        Type:  bug                |       Status:  new         
    Priority:  high               |    Milestone:  7.2.1       
   Component:  libraries (other)  |      Version:  7.1         
    Keywords:                     |     Testcase:              
   Blockedby:                     |   Difficulty:              
          Os:  Unknown/Multiple   |     Blocking:              
Architecture:  Unknown/Multiple   |      Failure:  None/Unknown
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Changes (by tibbe):

 * cc: johan.tibell@… (added)


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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4342#comment:9>
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