[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:  deriving
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #15831            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * keywords:  derivingvia => deriving
 * related:   => #15831


Comment:

 Great test case. I have a strong hunch that this is a symptom of #15831.
 When I get around to fixing that, I'll check whether that fixes this
 ticket as well.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16181#comment:2>
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