[GHC] #9575: -XAutoDeriveTypeable fails to generate instances

[GHC]

#9575: -XAutoDeriveTypeable fails to generate instances
-------------------------------------+-------------------------------------
              Reporter:  hvr         |            Owner:  dreixel
                  Type:  bug         |           Status:  new
              Priority:  high        |        Milestone:  7.8.4
             Component:  Compiler    |          Version:  7.8.3
            Resolution:              |         Keywords:
      Operating System:              |     Architecture:  Unknown/Multiple
  Unknown/Multiple                   |       Difficulty:  Unknown
       Type of failure:              |       Blocked By:
  None/Unknown                       |  Related Tickets:
             Test Case:              |
  deriving/should_compile/T8950      |
              Blocking:              |
Differential Revisions:              |
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Changes (by dreixel):

 * testcase:   => deriving/should_compile/T8950


Comment:

 `deriving/should_compile/T8950` already tests for this.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9575#comment:6>
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