[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:  merge
        Priority:  normal            |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D1825
       Wiki Page:                    |
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Changes (by RyanGlScott):

 * status:  patch => merge


Comment:

 I've updated [https://ghc.haskell.org/trac/ghc/wiki/Design/Warnings
 Design/Warnings] to include the changes here and bring up the idea of
 `-Wpedantic`, if someone wants to implement that.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11451#comment:37>
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