[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:  6.10 branch
Component:  Compiler                                     |        Version:  6.6        
 Severity:  normal                                       |     Resolution:             
 Keywords:  Modules Recursively Imported Error Messages  |     Difficulty:  Unknown    
 Testcase:                                               |   Architecture:  x86        
       Os:  Linux                                        |  
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Changes (by igloo):

  * milestone:  6.8 branch => 6.10 branch

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/1856#comment:4>
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