You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: sleep.rs
    path of file: ./repos/may/examples
    
    the code of the file until where you have to start completion: extern crate generator;
#[macro_use]
extern crate may;
use std::time::Duration;

use generator::Gn;
use may::coroutine;

fn main() {
    coroutine::scope(|scope| {
   
    
fn main() {
    coroutine::scope(|scope| {
        go!(scope, || {
            let g = Gn::<()>::new_scoped(|mut scope| {
                let (mut a, mut b) = (0, 1);
                while b < 200 {
                    std::mem::swap(&mut a, &mut b);
                    // sleep in the coroutine context
                    // simulate the timeout event as event iterator
                    coroutine::sleep(Duration::from_millis(100));
                    b += a;
                    scope.yield_(b);
                }
                a + b
            });
            g.fold((), |_, i| {
                println!("got {i}");
                // yield_now();
            });
        });
    });
}