[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:  #6204             |  
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Comment(by thoughtpolice):

 Related: Richard Eisenberg's recent paper, "Towards dependently typed
 Haskell: System FC with kind equality" attacks almost exactly these
 problems I think. Or at least, it addresses the notion of promoting GADTs
 and indexing them by e.g. kinds (and the usual kin: kind families, etc.)

 http://www.cis.upenn.edu/~eir/papers/2013/fckinds/fckinds-extended.pdf
 (Section 2, "Shallow Embedding" followed by "Deep embedding" gives an
 example of promoting GADTs.)

 I don't know what the status of this work is, but at the least you can use
 this paper as a basis to discuss precisely what you do/do not want?

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/7961#comment:4>
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