[GHC] #11451: Inconsistent warnings for unused binders

[GHC]

#11451: Inconsistent warnings for unused binders
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        Reporter:  simonpj           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       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):
       Wiki Page:                    |
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Comment (by simonpj):

 So the principle you are suggesting is that if it shows up in
 documentation you do not want to have a warning for unused variables.

 That's a fine principle; I just want to articulate it clearly. If so we
 should ensure that
 {{{
 type instance F (Maybe a) = Int
 }}}
 does not give a warning.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11451#comment:16>
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