[GHC] #7880: Require "forall" in definitions of polymorphic types

[GHC]

#7880: Require "forall" in definitions of polymorphic types
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        Reporter:  monoidal                     |            Owner:
            Type:  bug                          |           Status:  closed
        Priority:  normal                       |        Milestone:
       Component:  Compiler                     |          Version:  7.6.3
      Resolution:  duplicate                    |         Keywords:
Operating System:  Unknown/Multiple             |     Architecture:
 Type of failure:  GHC accepts invalid program  |  Unknown/Multiple
       Test Case:                               |       Difficulty:
        Blocking:                               |  Unknown
                                                |       Blocked By:
                                                |  Related Tickets:
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Changes (by monoidal):

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


Comment:

 I see this exact proposal was created earlier: #4426.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7880#comment:7>
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