[GHC] #12837: KnownNat and KnownSymbol should be abstract

[GHC]

#12837: KnownNat and KnownSymbol should be abstract
-------------------------------------+-------------------------------------
        Reporter:  adamgundry        |                Owner:  sean
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC accepts       |  Unknown/Multiple
  invalid program                    |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2898
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by sean):

 * differential:   => Phab:D2898


--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12837#comment:4>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler