[GHC] #16311: Suggest -XExistentialQuantification for 'forall' in data declarations

[GHC]

#16311: Suggest -XExistentialQuantification for 'forall' in data declarations
-------------------------------------+-------------------------------------
        Reporter:  int-index         |                Owner:  (none)
            Type:  task              |               Status:  merge
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.7
  (Parser)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  rename/should_fail/rnfail053
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |  https://gitlab.haskell.org/ghc/ghc/merge_requests/363
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * status:  patch => merge
 * testcase:   => rename/should_fail/rnfail053


Comment:

 Landed in
 [https://gitlab.haskell.org/ghc/ghc/commit/887454d8889ca5dbba70425de41d97939cb9ac60
 887454d8889ca5dbba70425de41d97939cb9ac60].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16311#comment:6>
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