[GHC] #12625: Bad error message for flags with required but missing arguments

[GHC]

#12625: Bad error message for flags with required but missing arguments
-------------------------------------+-------------------------------------
        Reporter:  dramforever       |                Owner:  RolandSenn
            Type:  bug               |               Status:  patch
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:  T12625
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):  Phab: D5030
       Wiki Page:                    |
-------------------------------------+-------------------------------------
Changes (by RolandSenn):

 * status:  new => patch
 * testcase:   => T12625
 * differential:   => Phab: D5030


Comment:

 Fix in [https://phabricator.haskell.org/D5030].

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12625#comment:2>
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