GHC missreports import as redundant.

In the following code GHC claims the first import is redundant.

import Data.Map (Map)

import qualified Data.Map as M

type MT = Map

test.hs:5:1: warning: [-Wunused-imports]
    The qualified import of `Data.Map' is redundant
      except perhaps to import instances from `Data.Map'
    To import instances alone, use: import Data.Map()
  |
5 | import qualified Data.Map as M

Reproduceable on 8.4 and HEAD at least.

Trac metadata

Trac field	Value
Version	8.6.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	Compiler
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