[GHC] #14048: Data instances of kind Constraint

[GHC]

#14048: Data instances of kind Constraint
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #12369            |  Differential Rev(s):  Phab:D4479
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * differential:   => Phab:D4479


Comment:

 Until we've agreed to actually allow this feature, Phab:D4479 properly
 catches uses of data types with return kind `Constraint` and rejects them.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14048#comment:9>
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