[GHC] #8583: Associated pattern synonyms

[GHC]

#8583: Associated pattern synonyms
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        Reporter:  cactus            |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:
      Resolution:                    |             Keywords:
                                     |  PatternSynonyms
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:  5144              |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 See #11461 for how to approximate this feature in current GHC.

 Richard, how does your comment:7 apply here? Or to the example in #11224?
 The status quo seems to be that type arguments are "inputs", rather than
 "outputs", of the pattern synonym.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8583#comment:10>
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