[GHC] #11461: Allow pattern synonyms to be bundled with type classes?

[GHC]

#11461: Allow pattern synonyms to be bundled with type classes?
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        Reporter:  mpickering        |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
                                     |  PatternSynonyms
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 Iceland_jack):

 Did you mean

 {{{#!hs
 instance Nullable Maybe where
   null = isNothing

 pattern Null :: Nullable f => f a
 pattern Null <- (null -> True)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11461#comment:2>
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