mlua 0.11.4

High level bindings to Lua 5.4/5.3/5.2/5.1 (including LuaJIT) and Luau with async/await features and support of writing native Lua modules in Rust.
Documentation 
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use mlua::{Lua, UserData};

fn main() {
    struct MyUserData<'a>(&'a mut i32);
    impl UserData for MyUserData<'_> {}

    let mut i = 1;

    let lua = Lua::new();
    lua.scope(|scope| {
        let _a = scope.create_userdata(MyUserData(&mut i)).unwrap();
        let _b = scope.create_userdata(MyUserData(&mut i)).unwrap();
        Ok(())
    });
}