[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           
    Keywords:                    |          Os:  Unknown/Multiple
Architecture:  Unknown/Multiple  |     Failure:  None/Unknown    
  Difficulty:  Unknown           |    Testcase:                  
   Blockedby:                    |    Blocking:                  
     Related:  #6024             |  
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Changes (by danharaj):

  * related:  #6204 => #6024


Comment:

 This recent preprint from Sam Lindley and Conor McBride is relevant:
 https://personal.cis.strath.ac.uk/conor.mcbride/pub/hasochism.pdf

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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7961#comment:13>
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