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Play an indefinite tone of a given frequency.
For instance:
extern crate beep;
extern crate dimensioned;
use std::{thread, time};
use beep::beep;
use dimensioned::si;
fn main() {
beep(440. * si::HZ);
thread::sleep(time::Duration::from_millis(500));
beep(si::Hertz::new(880));
thread::sleep(time::Duration::from_millis(500));
beep(0. * si::HZ);
}