[GHC] #9037: Add option to make selected warnings errors

[GHC]

#9037: Add option to make selected warnings errors
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        Reporter:  nh2               |                Owner:
            Type:  feature request   |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.8.2
      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 hvr):

 Fwiw, this is related to Design/Warnings which proposes to use `-Werror
 =redundant-imports` to selectively promote some warnings to errors.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9037#comment:3>
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