[GHC] #10607: Auto derive from top to bottom

[GHC]

#10607: Auto derive from top to bottom
-------------------------------------+-------------------------------------
        Reporter:  songzh            |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.11
      Resolution:                    |             Keywords:  deriving,
                                     |  typeclass, auto
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #13324            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * related:   => #13324


Comment:

 Alright. I've opened up #13324 to track the feature request for using type
 wildcards in derived instance contexts, since that has applications
 besides `derive-topdown`.

 Song, would this approach work for your needs?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10607#comment:18>
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