[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 simonpj):

 Notes from conversation with Herbert and Simon PJ.  Proposed data types:
 {{{
 data Warnings = ... | WarnSome [WarnItem]
 data WarnItem = WI OccName WarnInfo (Located SourceText) [Located
 (SourceText,FastString)]
 data WarnInfo = Warning | DeprecTop | DeprecMeth
 }}}
 The new bit is the `DeprecMeth`.

 Need updated ticket description, or wiki page, to give examples of the
 different behaviour.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10071#comment:8>
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