Agda-2.3.2.2: src/pkg/Interface/Command/Unregister.hs
-- -- -----------------------------------------------------------------------------
-- -- Exposing, Hiding, Unregistering are all similar
-- exposePackage :: PackageIdentifier -> Verbosity -> [Flag] -> Force -> IO ()
-- exposePackage = modifyPackage (\p -> [p{exposed=True}])
-- hidePackage :: PackageIdentifier -> Verbosity -> [Flag] -> Force -> IO ()
-- hidePackage = modifyPackage (\p -> [p{exposed=False}])
-- unregisterPackage :: PackageIdentifier -> Verbosity -> [Flag] -> Force -> IO ()
-- unregisterPackage = modifyPackage (\_ -> [])