[GHC] #12087: Inconsistency in GADTs?

[GHC]

#12087: Inconsistency in GADTs?
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        Reporter:  Iceland_jack      |                Owner:
            Type:  task              |               Status:  closed
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:  invalid           |             Keywords:  GADTs
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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Changes (by thomie):

 * status:  new => closed
 * resolution:   => invalid


Comment:

 > f :: Ord a => Eq a => a -> Bool

 This is not valid Haskell. See #11540.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12087#comment:1>
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