"没有运行中的反应堆"系统突然崩溃时会引起恐慌

struct A {}

impl actix::Actor for A {
    type Context = actix::Context<Self>;

    fn started(&mut self, ctx: &mut Self::Context) {
        use actix::AsyncContext;
        ctx.run_interval(std::time::Duration::from_millis(100), |_a, _c| {
            println!("Hi!");
        });
    }
}

fn main() {
    actix_rt::System::new().block_on(async {
        actix::Actor::start(A {});
        // tokio::time::sleep(std::time::Duration::from_millis(1)).await;
    });
}
`Cargo.toml`
```toml
[dependencies]
actix = "0.13.0"
actix-rt = "2.7.0"
tokio = { version = "1.17.0", features = ["time"]}