[GHC] #10071: Implement deprecation-warnings for class-methods to non-method transitions

[GHC]

#10071: Implement deprecation-warnings for class-methods to non-method transitions
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        Reporter:  hvr               |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.8.4
      Resolution:                    |             Keywords:  AMP MonadFail
                                     |  deprecate warning
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #8004, #4834,     |  Differential Rev(s):
  #4879, #2119                       |
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Comment (by bgamari):

 See [[Design/DeprecationMechanisms]] for a summary of this and related
 deprecation proposals.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10071#comment:16>
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