[GHC] #8129: Constraint solver panic due to derived type function equality

[GHC]

#8129: Constraint solver panic due to derived type function equality
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        Reporter:  adamgundry                    |            Owner:
            Type:  bug                           |           Status:
        Priority:  high                          |  closed
       Component:  Compiler (Type checker)       |        Milestone:
      Resolution:  fixed                         |          Version:  7.7
Operating System:  Unknown/Multiple              |         Keywords:
 Type of failure:  Compile-time crash            |     Architecture:
       Test Case:                                |  Unknown/Multiple
  indexed_types/should_fail/T8129                |       Difficulty:
        Blocking:                                |  Unknown
                                                 |       Blocked By:
                                                 |  Related Tickets:
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Comment (by rwbarton):

 Or `tests/indexed-types/should_fail/T8129.stdout`, rather. I see
 {{{
       Could not deduce (C x0 y0)
     Could not deduce (C x0 y0)
 }}}
 but I have no idea whether it's correct. (Simon?)

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8129#comment:7>
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