[GHC] #9839: RTS options parser silently accepts invalid flags

[GHC]

#9839: RTS options parser silently accepts invalid flags
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        Reporter:  adamgundry        |                   Owner:
            Type:  bug               |                  Status:  new
        Priority:  highest           |               Milestone:  7.12.1
       Component:  Runtime System    |                 Version:  7.8.3
      Resolution:                    |                Keywords:  newcomer
Operating System:  Unknown/Multiple  |            Architecture:
 Type of failure:  Incorrect result  |  Unknown/Multiple
  at runtime                         |               Test Case:
      Blocked By:                    |                Blocking:
 Related Tickets:  #4243             |  Differential Revisions:  Phab:D748
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Changes (by simonmar):

 * priority:  high => highest


Comment:

 Must fix before 7.12.1

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/9839#comment:8>
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