[GHC] #14229: Contraditions in users_guide/using-warnings.html

[GHC]

#14229: Contraditions in users_guide/using-warnings.html
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        Reporter:  MikolajKonarski   |                Owner:  voanhduy1512
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Documentation     |              Version:  8.2.1
      Resolution:                    |             Keywords:  newcomers
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Documentation     |  Unknown/Multiple
  bug                                |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D4528,
       Wiki Page:                    |  Phab:D4562
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Comment (by voanhduy1512):

 Replying to [comment:12 MikolajKonarski]:
 > I'm not sure, because many of the new warnings are added with the
 intention of adding them to -Wall sooner or later, so the positive list
 would need to grow, too. Also, the list of warnings included in -Wall is
 much longer than the list of warnings excluded. An option is to provide
 both lists and remark that if a warning is on neither list, it must be a
 new one and please file a Trac ticket. Then we are at least not stating a
 falsehood.

 I try to build a list status of options here
 https://gist.github.com/voanhduy1512/7769e04b925069170212400b57f5d4a3.
 Right now there is more options which excluded in `-Wall` than included.
 Maybe it will be change in future but i think it's easier to add positive
 list.

 For example i add a option to `-Wall` but forgot to update the doc, it's
 easy to update the doc to correct state just by looking at the code.
 As for current state, i need to get all options, minus all default
 options, minus all `-W`, `-Wall`, to get the real list that are not in
 `-Wall`.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14229#comment:14>
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