[GHC] #12099: ghc --show-options lists invalid flags

[GHC]

#12099: ghc --show-options lists invalid flags
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        Reporter:  DanielG           |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Other             |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab:D2281
       Wiki Page:                    |
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Changes (by sgillespie):

 * differential:   => Phab:D2281


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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12099#comment:2>
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