[GHC] #12529: Error message: visible type application of constructor/variable that is not in scope

[GHC]

#12529: Error message: visible type application of constructor/variable that is not
in scope
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        Reporter:  Iceland_jack      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  TypeApplications
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Iceland_jack):

 This gave me pause when I thought `Proxy` was in scope and tried applying
 to to a type variable `Proxy @s`

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12529#comment:1>
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