[GHC] #13895: "Illegal constraint in a type" error - is it fixable?

[GHC]

#13895: "Illegal constraint in a type" error - is it fixable?
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        Reporter:  RyanGlScott       |                Owner:  (none)
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  8.0.1
  checker)                           |             Keywords:  TypeInType,
      Resolution:                    |  ImpredicativeTypes
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12045, #14845,   |  Differential Rev(s):  Phab:D4728
  #14859                             |
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * status:  new => patch
 * differential:   => Phab:D4728


Comment:

 Phab:D4728 adds a test case for the latter part of the ticket (catching an
 illegal use of a constraint in a kind, as in `forall (t :: forall (k ::
 Type). Typeable k => ...)`).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13895#comment:7>
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