map -package:containers is:exact -package:ghc -package:base-prelude -package:basement -package:invertible -package:hedgehog -package:aeson -package:foldl -package:monoidal-containers -package:pipes -package:insert-ordered-containers -package:regex-tdfa -package:bytestring package:charset

map :: (Char -> Char) -> CharSet -> CharSet
charset Data.CharSet