[GHC] #15389: -Wall-missed-specialisations warnings not fatal with -Werror

[GHC]

#15389: -Wall-missed-specialisations warnings not fatal with -Werror
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        Reporter:  ChaiTRex          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.4.3
      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 ChaiTRex):

 It still would be a bug. The
 [https://downloads.haskell.org/~ghc/latest/docs/html/users_guide/using-
 warnings.html#ghc-flag--Werror documentation for -Werror] is:

 > **-Werror**
 >
 >     Makes any warning into a fatal error. Useful so that you don’t miss
 warnings when doing batch compilation.

 If that documentation (and perhaps other documentation for `-Werror`) is
 incorrect, it should be changed.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15389#comment:3>
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