[GHC] #11039: Panic with incorrect pattern synonym signature

[GHC]

#11039: Panic with incorrect pattern synonym signature
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        Reporter:  mpickering        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:
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 Ben Gamari <ben@…>):

 In [changeset:"fce758c5a5a54e8cfa491c5168893854bf7e974d/ghc" fce758c/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="fce758c5a5a54e8cfa491c5168893854bf7e974d"
 Add failing test for #11039

 Reviewers: austin, bgamari

 Subscribers: thomie

 Differential Revision: https://phabricator.haskell.org/D1406

 GHC Trac Issues: #11039
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11039#comment:1>
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