[GHC] #9069: -XDeriveTraversable should imply -XDeriveFunctor and -XDeriveFoldable

[GHC]

#9069: -XDeriveTraversable should imply -XDeriveFunctor and -XDeriveFoldable
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       Reporter:  sjoerd_visscher   |             Owner:
           Type:  feature request   |            Status:  new
       Priority:  normal            |         Milestone:
      Component:  Compiler          |           Version:  7.8.2
       Keywords:                    |  Operating System:  Unknown/Multiple
   Architecture:  Unknown/Multiple  |   Type of failure:  None/Unknown
     Difficulty:  Unknown           |         Test Case:
     Blocked By:                    |          Blocking:
Related Tickets:                    |
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 In the discussion in #2953 it was concluded that it would be best to have
 separate flags for deriving Functor, Foldable and Traversable. I agree
 with that conclusion, but it seems that it wasn't considered to have
 -XDeriveTraversable imply -XDeriveFunctor and -XDeriveFoldable. I can't
 think of a reason not to want that.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9069>
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