[GHC] #11387: Typecasting using type application syntax

[GHC]

#11387: Typecasting using type application syntax
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        Reporter:  Iceland_jack      |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:
      Resolution:                    |             Keywords:
                                     |  TypeApplications
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11350            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by rwbarton):

 For one thing, `pi` quantifiers would come in a specific order, while
 `Typeable` constraints live in a bag of constraints. What would happen if
 you have multiple types to match on?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11387#comment:3>
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