[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  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:  #8004, #4384      |                Blocking:
                                     |  Differential Revisions:
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Comment (by hvr):

 Replying to [comment:3 simonpj]:
 > Better. Syntax: why not just do this for a nested DEPRECATED pragma,
 thus

 Works too (I'm only slightly worried that it might be confusing for users
 that the indentation-level of the `{-# DEPRECATED #-}`  changes its
 semantics, but I have no strong preference here)

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10071#comment:4>
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