[GHC] #14952: Warning messages use white text which is unreadable on white background terminals

[GHC]

#14952: Warning messages use white text which is unreadable on white background
terminals
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        Reporter:  Koterpillar       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      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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Changes (by Koterpillar):

 * Attachment "Screen Shot 2018-03-21 at 07.41.47.png" added.

 Output on white background terminal

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14952>
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