[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:12 simonpj]:
 > I hear you.  But as compiler writers we have a limited complexity budget
 and number of implementation cycles, and we need to think how best to
 spend them in the service of our users.  Both in the initial cost of
 design and implementation and in the ongoing cost of maintenance.  I think
 what you want is hard, so there's a risk of making the best be the enemy
 of the good.

 Bgamari suggested a general mechanism like [[Design/LocalWarningPragmas]]
 that would certainly make `NO_WARN_REDUNDANT_CONSTRAINTS` unnecessary.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10635#comment:13>
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