[GHC] #11993: RFC, allow local bindings in pattern synonyms

[GHC]

#11993: RFC, allow local bindings in pattern synonyms
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        Reporter:  Iceland_jack      |                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:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mpickering):

 I don't think this is a terrible idea but it does mean that the overloaded
 `where` could also be used in a non-overloaded way. I'm inclined to say
 that we should leave things as they are for now.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11993#comment:1>
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