map is:exact -package:text -package:containers -package:basement -package:invertible -package:blaze-html -package:os-string -package:aeson -package:foldl -package:Cabal-syntax -package:insert-ordered-containers -package:incipit-base -package:monoidal-containers -package:imports -package:filepath -package:vector package:vector-stream

Map a function over a Stream