[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)
-------------------------------------+-------------------------------------
        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:                    |
-------------------------------------+-------------------------------------

Comment (by SimonHengel):

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

 Yes, this is what GHC < 8.0.1 did.

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/15393#comment:2>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler