[GHC] #13064: Incorrect redudant imports warning

[GHC]

#13064: Incorrect redudant imports warning
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        Reporter:  phadej            |                Owner:  davide
            Type:  bug               |               Status:  new
        Priority:  high              |            Milestone:  8.8.1
       Component:  Compiler          |              Version:  8.0.1
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
 Type of failure:  Incorrect         |  Unknown/Multiple
  error/warning at compile-time      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:  #15393            |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by davide):

 I've submitted some PRs to fix the impending unused import warnings:

 * https://github.com/haskell/cabal/pull/5673
 * https://github.com/kolmodin/binary/pull/159
 * https://github.com/haskell/bytestring/pull/168
 * https://github.com/haskell/containers/pull/576
 * https://github.com/haskell/text/pull/240

 I've also added a new ghc patch here:
 https://phabricator.haskell.org/D5312

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13064#comment:43>
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