[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):

 I understand -Wall as the option that allows reasonably designed code to
 pass without warnings. There are good reasons to have redundant
 constraints as I sketched in the ticket description. It's crucial to be
 able to make code -Wall warning-free otherwise relevant warnings are
 easily overlooked in a flood of irrelevant warnings. According to my
 programming style I often add e.g. -fwarn-incomplete-uni-patterns -fwarn-
 tabs -fwarn-missing-import-lists. They match my style of programming but
 seem to interfere with other's style, thus they are not part of -Wall.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/10635#comment:3>
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