Thread::set_hook only effective for the last time

[rise0chen]

use futures_util::future::join_all;
use mlua::prelude::*;

#[tokio::main(flavor = "current_thread")]
async fn main() -> LuaResult<()> {
    let lua = Lua::new();
    let func = lua
        .load(
            r#"
            local x = 2 + 3
            local y = x * 63
            local z = string.len(x..", "..y)
        "#,
        )
        .into_function()?;

    let mut cos: Vec<LuaAsyncThread<_, ()>> = Vec::new();
    for i in 0..3 {
        let thread = lua.create_thread(func.clone())?;
        thread.set_hook(LuaHookTriggers::EVERY_LINE, move |_lua, _debug| {
            println!("test hook {}", i);
            Ok(LuaVmState::Continue)
        });
        cos.push(thread.into_async(()));
    }
    join_all(cos).await;

    lua.remove_hook();

    Ok(())
}

It not print test hook 0 and test hook 1

[rise0chen]

set_hook is global in v0.6.

set hook for every coroutine can't work in new version.
#347

[rise0chen]

I think global is more concise and more practical, even if it doesn't comply with Lua rules.