[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:                    |
-------------------------------------+-------------------------------------

Comment (by RyanGlScott):

 songzh, I finally delivered on my promise to implement the ability to use
 `PartialTypeSignatures` in standalone `deriving` declarations //à la//
 `deriving _ => Eq (Foo a)`. Does this make things easier for you on your
 end?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10607#comment:23>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler