[GHC] #7775: Mark intentionally omitted type class instances

[GHC]

#7775: Mark intentionally omitted type class instances
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              Reporter:  Lemming     |            Owner:
                  Type:  feature     |           Status:  closed
  request                            |        Milestone:
              Priority:  normal      |          Version:  7.7
             Component:  Compiler    |         Keywords:  instance warning
  (Type checker)                     |     Architecture:  Unknown/Multiple
            Resolution:  wontfix     |       Difficulty:  Unknown
      Operating System:              |       Blocked By:
  Unknown/Multiple                   |  Related Tickets:
       Type of failure:              |
  None/Unknown                       |
             Test Case:              |
              Blocking:              |
Differential Revisions:              |
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Comment (by Lemming):

 Maybe it can still become true via #9334.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/7775#comment:4>
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