[GHC] #14419: Check kinds for ambiguity

[GHC]

#14419: Check kinds for ambiguity
-------------------------------------+-------------------------------------
        Reporter:  goldfire          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.1
      Resolution:                    |             Keywords:  TypeInType
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by RyanGlScott):

 After faec8d358985e5d0bf363bd96f23fe76c9e281f7, this is partially done.
 This data type's kind is currently rejected for being ambiguous:

 {{{#!hs
 type family F a
 data T1 :: forall a. F a -> Type
 }}}

 However, it would be premature to call this issue fixed, since the
 following two data types with very similar kinds are //not// rejected as
 ambiguous:

 {{{#!hs
 data T2 :: F a -> Type
 data T3 (b :: F a)
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14419#comment:3>
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