[GHC] #12791: Superclass methods could be more aggressively specialised.

[GHC]

#12791: Superclass methods could be more aggressively specialised.
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        Reporter:  mpickering        |                Owner:  danharaj
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2714
       Wiki Page:                    |
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Comment (by simonpj):

 Could you try to say, in a precise way, what the patch is seeking to
 achieve; what programs will typecheck that don't now, with a number of
 examples; and what program won't typecheck despite the patch?  This is a
 long thread and I'm really very lost.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12791#comment:18>
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