[GHC] #16305: When should -Wmissed-specializations fire?

[GHC]

#16305: When should -Wmissed-specializations fire?
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        Reporter:  crockeea          |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.7
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Poor/confusing    |  Unknown/Multiple
  error message                      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by crockeea):

 Nearly. `-Wmissed-specs` warns when an *imported* function which has *any*
 "inline" pragma (haven't dug into which are allowed) doesn't get
 specialized.

 `-Wall-missed-specs` warns whenever any overloaded function fails to
 specialize, exactly as you say.

 Questions are:
 1. Should `-Wmissed-specs` warn in the example above?
 2. What should the "Probable fix" be for either flag?

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16305#comment:4>
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