[GHC] #12805: Generalise type of asProxyTypeOf

[GHC]

#12805: Generalise type of asProxyTypeOf
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           Reporter:  tomjaguarpaw   |             Owner:
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:
          Component:                 |           Version:  8.0.1
  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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 Could we please generalise the type of `asProxyTypeOf` to `asProxyTypeOf
 :: a -> proxy a -> a`?

 https://hackage.haskell.org/package/base-4.9.0.0/docs/Data-
 Proxy.html#v:asProxyTypeOf

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12805>
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