[GHC] #13116: Allow Overloaded things in patterns

[GHC]

#13116: Allow Overloaded things in patterns
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        Reporter:                    |                Owner:  (none)
  facundo.dominguez                  |
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
                                     |  OverloadedLabels,
                                     |  OverloadedStrings, OverloadedLists
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11671            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by nomeata):

 Note that this already works for `OverloadedStrings`:
 {{{
 $ ghci
 GHCi, version 8.0.2: http://www.haskell.org/ghc/  :? for help
 Prelude> :set -XOverloadedStrings
 Prelude> import Data.Text
 Prelude Data.Text> let foo :: Text -> Text; foo "foo" = "bar"
 Prelude Data.Text> foo "foo"
 "bar"
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13116#comment:6>
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