A rustlang adapter for readers which delegate read bytes to a writer, adapted from the standard library's std::io::Read#tee which has since been deprecated.

Add the following to your Cargo.toml file

[dependencies]
tee = "0.1"

rustdoc api documentation can be found here

The currently unstable/deprecated std library function looks like this

let tee_reader = reader.tee(writer);

With tee, this looks more like

let tee_reader = tee::TeeReader::new(reader, writer);

Doug Tangren (softprops) 2015