rust coroutine

需切换到nightly版本

rustup override set nightly

#![feature(coroutines, coroutine_trait, stmt_expr_attributes)]

use std::ops::{Coroutine, CoroutineState};
use std::pin::Pin;

fn main() {
    let mut coroutine = #[coroutine] || {
        yield 1;
        return "foo"
    };

    match Pin::new(&mut coroutine).resume(()) {
        CoroutineState::Yielded(1) => {println!("11");}
        _ => panic!("unexpected value from resume"),
    }
    match Pin::new(&mut coroutine).resume(()) {
        CoroutineState::Complete("foo") => {println!("foo");}
        _ => panic!("unexpected value from resume"),
    }
}