[GHC] #13465: Foldable deriving treatment of tuples is too surprising

[GHC]

#13465: Foldable deriving treatment of tuples is too surprising
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        Reporter:  dfeuer            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.4.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by dfeuer):

 Replying to [comment:1 hvr]:
 > Same goes for `-XDeriveFunctor` btw

 `DeriveFunctor` will only surprise by succeeding when might not expect it
 to; it cannot really have surprising behavior.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13465#comment:2>
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