map is:exact -package:vector -package:containers -package:basement -package:base-compat-batteries -package:base-prelude -package:filepath -package:charset -package:base -package:aeson -package:foldl -package:insert-ordered-containers -package:os-string -package:monoidal-containers -package:text -package:invertible -package:ghc package:vector-stream

Map a function over a Stream