[GHC] #12396: Panic when specializing in another module

[GHC]

#12396: Panic when specializing in another module
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        Reporter:  crockeea          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Compile-time      |  Unknown/Multiple
  crash                              |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by zyla):

 On `HEAD` (`8.1.20170202`) this doesn't cause a panic.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12396#comment:3>
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