Futures-rs: impl Stream for future::Either

[Arnavion]

For code that returns one of multiple Streams it'd be nice to have future::Either also impl Stream.

fn foo() -> impl Stream {
    let v = match some_result {
        Ok(v) => v,
        Err(err) => return Either::A(stream::once(Err(err))),
    };

    return Either::B(some_stream(v));
}

[alexcrichton]

Sounds like a good idea to me!

[alexcrichton]

Added in https://github.com/rust-lang-nursery/futures-rs/pull/756

[tekjar]

Hi. Can this be backported to 0.1 to as well? benefits tokio users

[Kixunil]

@tekjar I've cherry picked it and made #1682

[tekjar]

Thanks @Kixunil