[GHC] #9301: Rank-2 constraints are assigned kind *

[GHC]

#9301: Rank-2 constraints are assigned kind *
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        Reporter:  heisenbug         |            Owner:
            Type:  bug               |           Status:  new
        Priority:  normal            |        Milestone:
       Component:  Compiler          |          Version:  7.8.2
      Resolution:                    |         Keywords:
Operating System:  Unknown/Multiple  |     Architecture:  Unknown/Multiple
 Type of failure:  None/Unknown      |       Difficulty:  Unknown
       Test Case:                    |       Blocked By:
        Blocking:                    |  Related Tickets:
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Comment (by heisenbug):

 Ooops, just repeated this experiment with 7.9.20140712 and now I get:
 {{{
 strangelet.hs:3:16:
     Illegal constraint: forall t. Num t
     In the type signature for ‘strangelet’:
       strangelet :: (forall t. Num t) => ()
 Failed, modules loaded: none.
 }}}
 So that type gets rejected.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9301#comment:3>
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