[GHC] #12360: Extend support for binding implicit parameters

[GHC]

#12360: Extend support for binding implicit parameters
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        Reporter:  MichaelBurge      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
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 Iceland_jack):

 This is a bad idea right:

 {{{#!hs
 pattern ImplicitTime :: (?t::UTCTime) => UTCTime
 pattern ImplicitTime = ?t

 printTime :: (?t :: UTCTime) => IO ()
 printTime = putStrLn $ show ImplicitTime

 main = do
   ImplicitTime <- getCurrentTime
   printTime
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12360#comment:5>
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