[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:  7.12.1
       Component:  Compiler          |                 Version:  7.8.4
      Resolution:                    |                Keywords:  AMP
Operating System:  Unknown/Multiple  |  MonadFail deprecate warning
 Type of failure:  None/Unknown      |            Architecture:
      Blocked By:                    |  Unknown/Multiple
 Related Tickets:  #8004, #4384,     |               Test Case:
  #4879, #2119                       |                Blocking:
                                     |  Differential Revisions:
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Changes (by hvr):

 * keywords:  AMP MonadFail => AMP MonadFail deprecate warning
 * related:  #8004, #4384, #4879 => #8004, #4384, #4879, #2119


Comment:

 (turns out there's yet another deprecation/warning related ticket...)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10071#comment:13>
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