[GHC] #16138: Export GHC.TypeNats.natSing for TypeApplications

[GHC]

#16138: Export GHC.TypeNats.natSing for TypeApplications
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           Reporter:  HateUsernames  |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:                 |           Version:  8.6.3
  libraries/base                     |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Now that TypeApplications is available `natSing` can be exposed so that it
 can be directly used like `natSing @n`.
 This allows for Proxy not to be used.

 http://hackage.haskell.org/package/base-4.12.0.0/docs/src/GHC.TypeNats.html#KnownNat

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16138>
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