[GHC] #4385: Type-level natural numbers

[GHC]

#4385: Type-level natural numbers
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        Reporter:  diatchki          |                   Owner:  diatchki
            Type:  feature request   |                  Status:  new
        Priority:  normal            |               Milestone:  7.12.1
       Component:  Compiler (Type    |                 Version:
  checker)                           |                Keywords:
      Resolution:                    |            Architecture:
Operating System:  Unknown/Multiple  |  Unknown/Multiple
 Type of failure:  None/Unknown      |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:                    |  Differential Revisions:
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Comment (by adamgundry):

 Iavor can probably say more than me, but I believe he is currently working
 on a type-nats constraint solver as a typechecker plugin that communicates
 with an SMT solver: https://github.com/yav/type-nat-solver

 More generally, the aim of the typechecker plugins work is to make this
 sort of thing easier to experiment with.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/4385#comment:72>
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