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//@ run-pass
#![feature(coroutines, coroutine_trait, stmt_expr_attributes)]
use std::ops::{Coroutine, CoroutineState};
use std::pin::Pin;
use std::sync::atomic::{AtomicUsize, Ordering};
static DROP: AtomicUsize = AtomicUsize::new(0);
#[derive(PartialEq, Eq, Debug)]
struct Dropper(String);
impl Drop for Dropper {
fn drop(&mut self) {
DROP.fetch_add(1, Ordering::SeqCst);
}
}
fn main() {
let mut g = #[coroutine]
|mut _d| {
_d = yield;
_d
};
let mut g = Pin::new(&mut g);
assert_eq!(
g.as_mut().resume(Dropper(String::from("Hello world!"))),
CoroutineState::Yielded(())
);
assert_eq!(DROP.load(Ordering::Acquire), 0);
match g.as_mut().resume(Dropper(String::from("Number Two"))) {
CoroutineState::Complete(dropper) => {
assert_eq!(DROP.load(Ordering::Acquire), 1);
assert_eq!(dropper.0, "Number Two");
drop(dropper);
assert_eq!(DROP.load(Ordering::Acquire), 2);
}
_ => unreachable!(),
}
drop(g);
assert_eq!(DROP.load(Ordering::Acquire), 2);
}
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