map -package:containers -package:base -package:insert-ordered-containers -package:basement -package:psqueues -package:conduit -package:monoidal-containers -package:os-string -package:case-insensitive -package:hedgehog -package:unordered-containers -package:dlist is:exact -package:dense-linear-algebra -package:imports package:foldl

Fold pairs into a map.