[GHC] #7150: unjustified overlapping instances error

[GHC]

#7150: unjustified overlapping instances error
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    Reporter:  maeder    |       Owner:                           
        Type:  bug       |      Status:  new                      
    Priority:  highest   |   Milestone:  7.6.1                    
   Component:  Compiler  |     Version:  7.6.1-rc1                
    Keywords:            |          Os:  Solaris                  
Architecture:  x86       |     Failure:  GHC rejects valid program
  Difficulty:  Unknown   |    Testcase:                           
   Blockedby:            |    Blocking:                           
     Related:            |  
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Comment(by maeder):

 If you uncomment the flags -DRDFLOGIC -DCASLEXTENSIONS in (line 115 of)
 var.mk, fewer files need to be compiled to get to the error.

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7150#comment:10>
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