[GHC] #15393: Regression: Detection of unused imports is imprecise (since GHC 8.0.1)

[GHC]

#15393: Regression: Detection of unused imports is imprecise (since GHC 8.0.1)
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        Reporter:  SimonHengel       |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:  8.6.1
       Component:  Compiler          |              Version:  8.4.1
      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:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by mpickering):

 To be complete, you are suggesting that the import of `Control.Monad` in
 `Foo.hs` should be warned as redundant?

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15393#comment:1>
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