[GHC] #3701: allow existential wrapper newtypes

[GHC]

#3701: allow existential wrapper newtypes
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        Reporter:  duncan            |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler (Type    |              Version:  6.10.4
  checker)                           |
      Resolution:                    |             Keywords:
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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Changes (by glaebhoerl):

 * cc: glaebhoerl (added)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3701#comment:16>
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