[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:  merge
        Priority:  normal            |            Milestone:  8.0.2
       Component:  Compiler          |              Version:  7.10.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  Incorrect         |            Test Case:
  warning at compile-time            |  typecheck/should_compile/T12067
      Blocked By:                    |             Blocking:
 Related Tickets:  #10347            |  Differential Rev(s):
       Wiki Page:                    |
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Changes (by simonpj):

 * testcase:   => typecheck/should_compile/T12067
 * status:  new => merge
 * milestone:   => 8.0.2


Comment:

 Thank you for the bug report!

 Ben/Austin: merge if convenient, but I don't think it's a show-stopper.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12067#comment:4>
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