[GHC] #13865: Add to Data.Proxy a utility function proxy :: a -> Proxy a

[GHC]

#13865: Add to Data.Proxy a utility function proxy :: a -> Proxy a
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        Reporter:  louispan          |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.2.1
       Component:  libraries/base    |              Version:  8.0.1
      Resolution:                    |             Keywords:  Proxy
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Hi louispan,

 It's worth noting that `Proxy` is an instance of `Applicative`, so your
 proposed `proxy` function is simply `pure`. Does that address your needs?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13865#comment:2>
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