[GHC] #16000: Don't suggest Rank2Types and RankNTypes, only the latter

[GHC]

#16000: Don't suggest Rank2Types and RankNTypes, only the latter
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           Reporter:  chessai        |             Owner:  (none)
               Type:  feature        |            Status:  new
  request                            |
           Priority:  normal         |         Milestone:  8.6.3
          Component:  Compiler       |           Version:  8.6.2
  (Parser)                           |
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  None/Unknown
  Unknown/Multiple                   |
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 Currently (as of GHC 8.6.2), error messages that suggest RankNTypes also
 suggest Rank2Types, but Rank2Types are deprecated.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16000>
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