[GHC] #13368: Derive superclasses automatically if possible

[GHC]

#13368: Derive superclasses automatically if possible
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        Reporter:  Iceland_jack      |                Owner:  (none)
            Type:  feature request   |               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:  #10607            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Iceland_jack):

 I figured there would be difficulties (`newtypes` causing trouble again
 via roles etc.), thanks for taking the time to respond. I'll continue
 thinking about this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13368#comment:2>
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