[GHC] #3701: allow existential wrapper newtypes

[GHC]

#3701: allow existential wrapper newtypes
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              Reporter:  duncan      |            Owner:
                  Type:  feature     |           Status:  new
  request                            |        Milestone:  7.10.1
              Priority:  low         |          Version:  6.10.4
             Component:  Compiler    |         Keywords:
  (Type checker)                     |     Architecture:  Unknown/Multiple
            Resolution:              |       Difficulty:  Unknown
      Operating System:              |       Blocked By:
  Unknown/Multiple                   |  Related Tickets:
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
-------------------------------------+-------------------------------------
Changes (by thomie):

 * difficulty:   => Unknown
 * component:  Compiler => Compiler (Type checker)


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/3701#comment:12>
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