[GHC] #11959: Importing doubly exported pattern synonym and associated pattern synonym panics

[GHC]

#11959: Importing doubly exported pattern synonym and associated pattern synonym
panics
-------------------------------------+-------------------------------------
        Reporter:  darchon           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  8.0.1-rc3
      Resolution:                    |             Keywords:
                                     |  PatternSynonyms
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2132,
       Wiki Page:                    |  Phab:D2133
-------------------------------------+-------------------------------------

Comment (by bgamari):

 mpickering has said that he doesn't have enough time to look at this in
 the near future so I may try to dust off my previous fix, Phab:D2133.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11959#comment:10>
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