ghc and the hs-packages now simply include the necessary (haskell)
package description files in lib/ghc/package.conf.d and update the
package.cache by running ghc-pkg recache at the end. register and
unregister scripts are no longer needed.
This module implements bag and set operations on ordered lists. For
the purposes of this module, a "bag" (or "multiset") is a non-decreasing
list, whereas a "set" is a strictly ascending list. Bags are sorted
lists that may contain duplicates, whereas sets are sorted lists
that do not contain duplicates.
ok sthen@
