[GHC] #12401: GHC panic! Template variable unbound in rewrite rule

[GHC]

#12401: GHC panic! Template variable unbound in rewrite rule
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        Reporter:  vagarenko         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Windows           |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by bgamari):

 * milestone:   => 8.0.2


Comment:

 Thanks for the rather minimal testcase. It can be minimized a bit further
 by eliminating the `Pixel{8,16}` synonyms with the RHSs.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12401#comment:2>
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