[GHC] #3731: SYB gone wild - mysterious <<loop>> in code derived from an syb-with-class example

[GHC]

#3731: SYB gone wild - mysterious <<loop>> in code derived from an syb-with-class
example
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    Reporter:  dsf               |       Owner:                             
        Type:  bug               |      Status:  new                        
    Priority:  normal            |   Milestone:                             
   Component:  Compiler          |     Version:  6.12.1                     
  Resolution:                    |    Keywords:                             
          Os:  Unknown/Multiple  |    Testcase:                             
Architecture:  Unknown/Multiple  |     Failure:  Incorrect result at runtime
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Changes (by dsf):

 * cc: dsf at seereason.com (added)
  * version:  6.12.1 RC1 => 6.12.1

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3731#comment:2>
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