Cannot use qualified both before and after the module [GHC-05661]

With the language extension ImportQualifiedPost it is possible to import a module using the qualified modifier after the name of the module. But it is not legal to use the qualified modifier both before and after the name of the module.

Examples

The module Prelude is incorrectly imported as qualified

In this example, the qualified modifier was used both before and after the name of the module which is imported. This is not legal syntax, and GHC emits this error message. The error can be fixed by removing one of the two occurrences.

messages/GHC-05661/doubleQualified/before/DoubleQualified.hs:4:26: error: [GHC-05661]
    Multiple occurrences of 'qualified'
  |
4 | import qualified Prelude qualified
  |                          ^^^^^^^^^

DoubleQualified.hs

Before

{-# LANGUAGE ImportQualifiedPost #-}
module DoubleQualified where

import qualified Prelude qualified

After

{-# LANGUAGE ImportQualifiedPost #-}
module DoubleQualified where

import Prelude qualified