[GHC] #12734: Unexpected context reduction stack overflow

[GHC]

#12734: Unexpected context reduction stack overflow
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        Reporter:  danilo2           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by simonpj):

 I know how hard it can be to boil out a repro case, but it's difficult to
 debug this kind of thing without it.

 One that might give some insight is to try `-ddump-cs-trace` which gives
 you soe idea of what the constraint solver is doing.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12734#comment:1>
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