6.3.5. Writing qualified in postpositive position — Glasgow Haskell Compiler 9.10.0.20240413 User's Guide

# 6.3.5. Writing qualified in postpositive position

`ImportQualifiedPost`

  Since: | 8.10.1
  Status: | Included in `GHC2024`, `GHC2021`

  `ImportQualifiedPost` allows the syntax `import M qualified`, that is, to annotate a module as qualified by writing `qualified` after the module name.

To import a qualified module usually you must specify `qualified` in prepositive position : `import qualified M`. This often leads to a “hanging indent” (which is automatically inserted by some autoformatters and common in many code bases. For example:

    import qualified A
    import           B
    import           C

The `ImportQualifiedPost` extension allows `qualified` to appear in postpositive position : `import M qualified`. With this extension enabled, one can write:

    import A qualified
    import B
    import C

It is an error if `qualified` appears in both pre and postpositive positions.

The warning `-Wprepositive-qualified-module` (off by default) reports on any occurrences of imports annotated `qualified` using prepositive syntax.