[GHC] #10632: ImplicitParams: GHC does not warn about unused implicit parameters

[GHC]

#10632: ImplicitParams: GHC does not warn about unused implicit parameters
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        Reporter:  mwnx              |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  lowest            |               Milestone:
       Component:  Compiler          |                 Version:  7.10.1
      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 Revisions:
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Comment (by simonpj):

 I think it works fine in HEAD.  Can others verify?
 {{{
 T10632.hs:5:6: warning:
     Redundant constraint: ?file1::String
     In the type signature for: f :: (?file1::String) => IO ()
 }}}
 If so, can someone add this as a regression test?

 I don't think it's worth messing with 7.10.

 Simon

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10632#comment:1>
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