[GHC] #10873: Bad error message for incorrect pattern synonym signature

[GHC]

#10873: Bad error message for incorrect pattern synonym signature
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        Reporter:  mpickering        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler (Type    |              Version:  7.10.2
  checker)                           |
      Resolution:                    |             Keywords:  newcomer
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 ak3n):

 Is it okay that GHC (master head) compiles it without problems now?

 Build of fork with test:

 https://travis-ci.org/ak3n/ghc/jobs/98938720

 Commit:

 https://github.com/ak3n/ghc/commit/aee63f611b30164cc1c828a66d22e6e7302af385

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10873#comment:3>
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