[GHC] #6028: warning for cyclic unimplemented defaults

[GHC]

#6028: warning for cyclic unimplemented defaults
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 Reporter:  lerkok            |          Owner:                  
     Type:  feature request   |         Status:  new             
 Priority:  normal            |      Component:  Compiler        
  Version:  7.4.1             |       Keywords:                  
       Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
  Failure:  None/Unknown      |       Testcase:                  
Blockedby:                    |       Blocking:                  
  Related:                    |  
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Comment(by lerkok):

 Recent relevant discussion in stack overflow:
 http://stackoverflow.com/questions/12270239/can-ghc-warn-if-class-
 instance-is-a-loop

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/6028#comment:2>
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