coroutine 0.8.0

Coroutine Library in Rust
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extern crate coroutine;
extern crate env_logger;

use std::usize;
use std::rc::Rc;
use std::cell::RefCell;
use coroutine::asymmetric::Coroutine;

fn main() {
    env_logger::init().unwrap();

    let rc = Rc::new(RefCell::new(0));

    let rc1 = rc.clone();
    let mut coro1 = Coroutine::spawn(move |me, _| {
        *rc1.borrow_mut() = 1;
        let val = *rc1.borrow();
        me.yield_with(val); // (*rc1.borrow()) - fails with already borrowed
        usize::MAX
    });

    let rc2 = rc.clone();
    let mut coro2 = Coroutine::spawn(move |me, _| {
        *rc2.borrow_mut() = 2;
        let val = *rc2.borrow();
        me.yield_with(val);
        usize::MAX
    });

    println!("First: {:?}", coro1.resume(0));
    println!("Second: {:?}", coro2.resume(0));
}