[GHC] #11451: Inconsistent warnings for unused binders in type and instance declarations

[GHC]

#11451: Inconsistent warnings for unused binders in type and instance declarations
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        Reporter:  simonpj           |                Owner:
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1825
       Wiki Page:                    |
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Comment (by RyanGlScott):

 Sorry, I'm wrong, it's also `-Wunused-matches` which warns about unused
 quantified type variables. Do you think it's worth having two separate
 flags for warning about term-level patterns vs. quantified type variables?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11451#comment:29>
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