[GHC] #1856: Improve error message for mutally recursive modules

[GHC]

#1856: Improve error message for mutally recursive modules
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    Reporter:  guest                                        |        Owner:             
        Type:  feature request                              |       Status:  new        
    Priority:  normal                                       |    Milestone:  6.12 branch
   Component:  Compiler                                     |      Version:  6.6        
    Severity:  normal                                       |   Resolution:             
    Keywords:  Modules Recursively Imported Error Messages  |   Difficulty:  Unknown    
    Testcase:                                               |           Os:  Linux      
Architecture:  x86                                          |  
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Changes (by igloo):

  * milestone:  6.10 branch => 6.12 branch

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1856#comment:5>
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