[GHC] #16181: ghc panic when using DerivingVia

[GHC]

#16181: ghc panic when using DerivingVia
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        Reporter:  chessai           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:  derivingvia
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by chessai):

 * keywords:   => derivingvia
 * failure:  None/Unknown => Compile-time crash or panic


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16181#comment:1>
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