map -package:containers -package:Cabal-syntax -package:basement -package:dlist -package:monoidal-containers -package:pipes -package:integration -package:os-string -package:insert-ordered-containers -package:bytestring -package:incipit-base -package:unordered-containers -is:exact -package:vector -package:base-compat-batteries package:vector-stream

Map a function over a Stream
Map a monadic function over a Stream
Execute a monadic action for each element of the Stream
Apply monadic function to each element and drop all Nothings