[GHC] #8346: Rank 1 type signature still requires RankNTypes

[GHC]

#8346: Rank 1 type signature still requires RankNTypes
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        Reporter:  tinctorius        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  7.6.3
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  GHC rejects       |  Unknown/Multiple
  valid program                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #2605             |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by tom-bop):

 (A note to the reader: `RankNTypes` and `Rank2Types` are now the same)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8346#comment:4>
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