[GHC] #7961: Remove restrictions on promoting GADT's

[GHC]

#7961: Remove restrictions on promoting GADT's
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        Reporter:  danharaj          |            Owner:
            Type:  feature request   |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.6.3
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:  #6024
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Comment (by danharaj):

 Adam Gundry has recently published his thesis which is wholly relevant to
 this ticket:
 https://personal.cis.strath.ac.uk/adam.gundry/thesis/

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7961#comment:14>
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