[GHC] #10635: -fwarn-redundant-constraints should not be part of -Wall

[GHC]

#10635: -fwarn-redundant-constraints should not be part of -Wall
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        Reporter:  Lemming           |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler (Type    |              Version:  7.11
  checker)                           |
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #9939, #9973,     |  Differential Rev(s):
  #10100, #10183                     |
       Wiki Page:                    |
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Comment (by Lemming):

 Replying to [comment:6 bgamari]:
 > It doesn't seem unreasonable to me to require users writing code like
 `asTypeOf1` to explicitly disable this warning. At the moment this can
 only be done on with module-level granularity but hopefully in the future
 we will have [[Design/LocalWarningPragmas|mechanisms]] for silencing
 warnings with greater precision.

 If would prefer to disable the warning per constraint. E.g. I could wrap a
 not strictly needed constraint in a magic {{{Used :: Constraint ->
 Constraint}}}. However, this would not be possible in Haskell 98.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10635#comment:8>
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