[GHC] #14270: GHC HEAD's ghc-stage1 panics on Data.Typeable.Internal

[GHC]

#14270: GHC HEAD's ghc-stage1 panics on Data.Typeable.Internal
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        Reporter:  hvr               |                Owner:  bgamari
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #14236            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by bgamari):

 The unbound binder in question is a coercion variable of  type,
 {{{
 cobox_a3S9 :: (TYPE :: (RuntimeRep -> *)) ~# (a_a3RX :: (k1_a3RW -> *))
 }}}

 This feels a bit like #13410, but there the the binders were of type
 `t~t`.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14270#comment:2>
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