[GHC] #8584: Pattern synonym type signatures

[GHC]

#8584: Pattern synonym type signatures
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        Reporter:  cactus            |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:  5144
        Blocking:                    |  Related Tickets:
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Comment (by nomeata):

 JFTR: The code in master already contains a `PatSynSig` constructor, but
 it is dead code...

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8584#comment:1>
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