[GHC] #11409: Cannot instantiate literals using TypeApplications

[GHC]

#11409: Cannot instantiate literals using TypeApplications
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        Reporter:  Feuerbach         |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.0.1-rc1
      Resolution:                    |             Keywords:
                                     |  TypeApplications
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #11352            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 The question always is: what type variable is being instantiated? Perhaps
 `f` has the type `forall a. a -> forall b. b -> (a, b)`. Then `f @t n`
 will be different from `f t @n`. And, as Stephanie and I describe in
 [http://cs.brynmawr.edu/~rae/papers/2016/type-app/visible-type-app.pdf our
 paper], there doesn't seem to be a way to add in extra flexibility.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11409#comment:23>
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