ezlua is unsound

[devzf]

Consider the following example:

use ezlua::prelude::*;

fn main() {
    let lua = Lua::with_open_libs();

    let st = std::rc::Rc::new(std::cell::RefCell::new(None));
    let st2 = st.clone();
    let f = lua
        .new_closure(move |s: LuaString<'static>| {
            st2.borrow_mut().replace(s);
        })
        .unwrap();
    lua.global().set("f", f).unwrap();
    lua.do_string("f('')", None).unwrap();

    let s = st.borrow();
    println!("{:?}", s.as_ref().map(|s| s.to_str()));
}

ezlua v0.3.1

[metaworm]

This is indeed a problem,

In order to implement universal function binding, it seems impossible to associate the lifetime parameters of LuaMethod with the &self reference of LuaState, otherwise it would compile wrong

In this case, the user should not declare the parameter's lifetime as 'static