#![feature(async_await)]
#![feature(await_macro)]
#![feature(futures_api)]

async fn foo<F: FnMut(usize)>(mut callback: F) {
    callback(5);
}

fn main() {
    futures::executor::block_on(async {
        await!(foo(|v| println!("{:?}", v)));
    });
}

// [dependencies]
// futures-preview = "0.3.0-alpha.11"