[GHC] #11062: Type families + hs-boot files = panic

[GHC]

#11062: Type families + hs-boot files = panic
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        Reporter:  goldfire          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:  TypeFamilies
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by ezyang):

 Another example of this is T6018, when built in one-shot mode.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11062#comment:5>
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