eyeball 0.2.0

Add observability to your Rust types!
Documentation 
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use eyeball::Observable;

#[tokio::test]
async fn lag() {
    let mut ob = Observable::new("hello, world!".to_owned());
    let mut rx1 = Observable::subscribe(&ob);
    let mut rx2 = Observable::subscribe(&ob);

    Observable::set(&mut ob, "A".to_owned());
    assert_eq!(rx1.next().await, Some("A".to_owned()));

    Observable::set(&mut ob, "B".to_owned());
    assert_eq!(rx1.next().await, Some("B".to_owned()));
    assert_eq!(rx2.next().await, Some("B".to_owned()));
}

#[tokio::test]
async fn lag_no_clone() {
    // no Clone impl
    struct Foo(String);

    let mut ob = Observable::new(Foo("hello, world!".to_owned()));
    let mut rx1 = Observable::subscribe(&ob);
    let mut rx2 = Observable::subscribe(&ob);

    Observable::set(&mut ob, Foo("A".to_owned()));
    assert_eq!(rx1.next_ref().await.as_ref().map(|f| f.0.as_str()), Some("A"));

    Observable::set(&mut ob, Foo("B".to_owned()));
    assert_eq!(rx1.next_ref().await.as_ref().map(|f| f.0.as_str()), Some("B"));
    assert_eq!(rx2.next_ref().await.as_ref().map(|f| f.0.as_str()), Some("B"));
}