use std::cell::RefCell;

struct Ctx {
    pub index: RefCell<usize>,
    msg: Vec<String>,
}

impl Ctx {
    fn new() -> Self {
        Ctx { index: RefCell::new(0), msg: vec![] }
    }
    fn next(&self) {
        *self.index.borrow_mut() += 1;
    }
}

// func (c *Context) Next() {
//     c.index++
//     for c.index < int8(len(c.handlers)) {
//         c.handlers[c.index](c)
//         c.index++
//     }
// }

#[test]
fn test_ref() {
    let c = Ctx::new();

    c.next();
    c.next();
    c.next();

    println!("index:{}", c.index.borrow());
}