[GHC] #11316: Too many guards warning causes issues

[GHC]

#11316: Too many guards warning causes issues
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        Reporter:  NeilMitchell      |                Owner:
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.0.1
       Component:  Compiler          |              Version:  7.11
      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 NeilMitchell):

 Understood about coverage and exhaustiveness, that makes sense.

 As long as in default mode the warning doesn't pop up, I'm happy. However,
 there are some people that always run with {{{-Wall}}}, and if that also
 turns on {{{-Wtoo-many-guards}}} then these people are going to be left
 with the nasty set of choices above. In general, introducing warnings that
 cannot be suppressed by refactorings that improve the code is something I
 dislike.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/11316#comment:6>
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