[GHC] #15957: Provide warning for when RecordWildCards LHS {..} doesn't bind anything.

[GHC]

#15957: Provide warning for when RecordWildCards LHS {..} doesn't bind anything.
-------------------------------------+-------------------------------------
        Reporter:  Fuuzetsu          |                Owner:  (none)
            Type:  feature request   |               Status:  closed
        Priority:  normal            |            Milestone:  8.10.1
       Component:  Compiler          |              Version:  8.6.2
      Resolution:  fixed             |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
                                     |  rename/should_compile/T15957,
                                     |  rename/should_fail/T15957_Fail
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |  https://gitlab.haskell.org/ghc/ghc/merge_requests/346
-------------------------------------+-------------------------------------
Changes (by RyanGlScott):

 * testcase:   => rename/should_compile/T15957,
               rename/should_fail/T15957_Fail
 * status:  new => closed
 * differential:   => https://gitlab.haskell.org/ghc/ghc/merge_requests/346
 * resolution:   => fixed
 * milestone:   => 8.10.1


Comment:

 Landed in
 [https://gitlab.haskell.org/ghc/ghc/commit/19626218566ea709b5f6f287d3c296b0c4021de2
 19626218566ea709b5f6f287d3c296b0c4021de2].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15957#comment:7>
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