[GHC] #10928: Refine pattern synonym signatures

[GHC]

#10928: Refine pattern synonym signatures
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        Reporter:  mpickering        |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
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Comment (by rwbarton):

 That's kind of weird. But you can write
 {{{
 pattern P :: a ~ Int => () => G a   -- current syntax; (Int ~ a) is
 provided constraint
 pattern P = MkG
 }}}
 and then `pat` is accepted...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10928#comment:18>
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