map -package:containers -package:insert-ordered-containers -is:exact -package:imports -package:dlist -package:ghc -package:dense-linear-algebra -package:base-prelude -package:blaze-html -package:invertible -package:os-string -package:charset -is:exact -package:filepath -package:conduit -package:psqueues -package:text is:exact -package:pipes package:foldl

Fold pairs into a map.