[GHC] #13342: Core Lint warnings are emitted on stdout rather than stderr

[GHC]

#13342: Core Lint warnings are emitted on stdout rather than stderr
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        Reporter:  mpickering        |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  low               |            Milestone:
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:  newcomer
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 mpickering):

 I think printing to the correct output is out primary importance here. If
 you don't interleave outputs and only inspect `stderr` for errors then you
 will not see these warnings.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13342#comment:4>
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