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GHC 10.0.0.20260917 · lts/ghc-10.0.x · fc4e598 · 2026-10-11

Moduleghc-10.0.0.20260917GHC2024

GHC.Unit.External.ModuleOrigin

  • 1 type
  • 5 values
datadata ModuleOrigin
#

Given a module name, there may be multiple ways it came into scope, possibly simultaneously. This data type tracks all the possible ways it could have come into scope. Warning: don't use the record functions, they're partial!

Constructors

  • ModHidden

    Module is hidden, and thus never will be available for import. (But maybe the user didn't realize), so we'll still keep track of these modules.)

  • ModUnusable !UnusableUnit

    Module is unavailable because the unit is unusable.

  • ModOrigin

    Module is public, and could have come from some places.

    • fromOrigUnit :: Maybe Bool

      Just False means that this module is in someone's exported-modules list, but that package is hidden; Just True means that it is available; Nothing means neither applies.

    • fromExposedReexport :: [UnitInfo]

      Is the module available from a reexport of an exposed package? There could be multiple.

    • fromHiddenReexport :: [UnitInfo]

      Is the module available from a reexport of a hidden package?

    • fromPackageFlag :: Bool

      Did the module export come from a package flag? (ToDo: track more information.

Instances3Semigroup, Monoid, Outputable
valuefromExposedModules :: Bool -> ModuleOrigin
#

Smart constructor for a module which is in exposed-modules. Takes as an argument whether or not the defining package is exposed.

valueoriginVisible :: ModuleOrigin -> Bool
#

Is the name from the import actually visible? (i.e. does it cause ambiguity, or is it only relevant when we're making suggestions?)

valueoriginEmpty :: ModuleOrigin -> Bool
#

Are there actually no providers for this module? This will never occur except when we're filtering based on package imports.