map -package:containers -package:aeson -package:case-insensitive -package:charset -package:dlist -package:base-compat-batteries -package:integration -package:Cabal-syntax -is:exact -package:basement -package:dense-linear-algebra -package:hedgehog -package:incipit-base -is:exact -is:exact package:foldl -is:exact is:exact

Fold pairs into a map.