[GHC] #12067: warn-unused-imports does not detect coersions

[GHC]

#12067: warn-unused-imports does not detect coersions
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        Reporter:  crockeea          |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  warning at compile-time            |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #10347            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by thomie):

 * related:   => #10347


Comment:

 Also happens with 8.0.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12067#comment:1>
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