[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
      Resolution:                    |         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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Comment (by sjoerd_visscher):

 I.e. add this to the `impliedFlags` list:
 {{{
     , (Opt_DeriveTraversable, turnOn, Opt_DeriveFunctor)
     , (Opt_DeriveTraversable, turnOn, Opt_DeriveFoldable)
 }}}

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9069#comment:1>
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