[GHC] #15798: Flag to warn when deriving strategy is not explicitly specified

[GHC]

#15798: Flag to warn when deriving strategy is not explicitly specified
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        Reporter:  andrewthad        |                Owner:  (none)
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.1
      Resolution:                    |             Keywords:  deriving,
                                     |  newcomer
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 monoidal):

 I would suggest `-Wmissing-deriving-strategies`, as there are several
 -Wmissing-* flags (missing-local-signatures, missing-import-lists,
 missing-home-modules etc.).

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15798#comment:5>
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