[GHC] #12101: Regression: Pattern synonyms make GHCi 8.0.1 crash

[GHC]

#12101: Regression: Pattern synonyms make GHCi 8.0.1 crash
-------------------------------------+-------------------------------------
        Reporter:  int-index         |                Owner:
            Type:  bug               |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  GHCi              |              Version:  8.0.1
      Resolution:  duplicate         |             Keywords:
                                     |  PatternSynonyms
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  GHCi crash        |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12007            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by mpickering):

 * testcase:
     https://gist.githubusercontent.com/int-
     index/17dfb68fd97f724aef2849d0defae0d6/raw/3dab71756bbafa197b93170310ccabfea8c92120/M.hs
     =>


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12101#comment:3>
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