Macro cogo::select_token

macro_rules! select_token {
    (
        $($name:pat = $top:expr => $bottom:expr), +$(,)?
    ) => { ... };
}

macro used to select for only one event it will return the index of which event happens first for example:

use cogo::{chan, select_token};

    let (s, r) = chan!();
    s.send(1);
    let id = select_token! {
        rv = r.recv() => {
            println!("{:?}",rv);
        }
    };