[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:  6.13            
Resolution:                               |       Keywords:                  
Difficulty:                               |             Os:  Unknown/Multiple
  Testcase:                               |   Architecture:  Unknown/Multiple
   Failure:  Incorrect result at runtime  |  
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Changes (by dsf):

  * version:  6.12.1 => 6.13

Comment:

 Ok, we have managed to make our way to HEAD!  This did indeed resolve the
 problem in Bug.hs.  However, a very similar issue still affects our
 application (as you suggested it might), and the example, which I have
 named Bug2.hs, is attached.  It still refers to some Happstack modules, if
 it would be helpful we could expand it so that those imports go away.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/3731#comment:7>
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