[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 RolandSenn):

 This is not a bug! The behavior described above is documented in the
 [https://downloads.haskell.org/~ghc/master/users-guide/using-warnings.html
 users guide] in section ''7.2. Warnings and sanity-checking'':

 The documentations for **-Wmissed-specialisations** and **-Wall-missed-
 specialisations** clearly states:
   ''Note that this warning will not throw errors if used with -Werror.''

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15389#comment:2>
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