[GHC] #9196: Higher-rank constraint treated as type instead

[GHC]

#9196: Higher-rank constraint treated as type instead
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        Reporter:  goldfire          |            Owner:
            Type:  bug               |           Status:  patch
        Priority:  normal            |        Milestone:  7.10.1
       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 Simon Peyton Jones <simonpj@…>):

 In [changeset:"9c621e9b1c7d8a02b48f06f041da605ce27f4d80/ghc"]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="9c621e9b1c7d8a02b48f06f041da605ce27f4d80"
 Reject forall types in constraints in signatures

 Fixes Trac #9196.  Thanks to archblob for an initial stab at this.
 In the end I fixed it in the kind checker rather than the subsequent
 validity check, (a) so that the error messages look more uniform,
 and (b) so that I did not need to meddle with isPredTy.
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9196#comment:6>
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