[GHC] #7336: Defined but not used is not detected for data types with instances

[GHC]

#7336: Defined but not used is not detected for data types with instances
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        Reporter:  maeder            |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  normal            |               Milestone:
       Component:  Compiler          |                 Version:  7.6.1
      Resolution:                    |                Keywords:
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  None/Unknown      |  Unknown/Multiple
      Blocked By:                    |               Test Case:
 Related Tickets:                    |  rename/should_compile/T7336
                                     |                Blocking:
                                     |  Differential Revisions:
-------------------------------------+-------------------------------------
Changes (by thomie):

 * cc: cactus (added)
 * status:  closed => new
 * resolution:  fixed =>


Comment:

 Commit [changeset:"22ddcfff16476a6d19190f10743a78bde0b2c28f/ghc"]
 mentions:

    "T7336 is expected to be broken because of a regression introduced by
 pattern synonym implementation"

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7336#comment:2>
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