[GHC] #10997: Pattern synonym causes Iface error.

[GHC]

#10997: Pattern synonym causes Iface error.
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        Reporter:  mpickering        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
                                     |  PatternSynonyms
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  typecheck/should_compile/T10997
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"0ce858e571f0f8f378f2b04f8d924d1fafeafdd1/ghc"
 0ce858e5/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="0ce858e571f0f8f378f2b04f8d924d1fafeafdd1"
 Zonk properly when checkig pattern synonyms

 Fixes Trac #10997

 Merge to stable branch
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10997#comment:9>
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