[GHC] #4020: Please consider adding support for local type synonyms

[GHC]

#4020: Please consider adding support for local type synonyms
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        Reporter:  nr                |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler (Type    |              Version:  6.12.2
  checker)                           |
      Resolution:                    |             Keywords:  type synonym
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):

 Allowing local data declarations would be more useful (local pattern
 synonyms even more so)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4020#comment:15>
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