[GHC] #15710: Should GHC accept a type signature that needs coercion quantification?

[GHC]

#15710: Should GHC accept a type signature that needs coercion quantification?
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        Reporter:  simonpj           |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.1
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12677            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by goldfire):

 #15870 is an example of someone actually trying this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15710#comment:10>
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