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() {
    // Should not allow userdata borrow to outlive lifetime of AnyUserData handle
    struct MyUserData<'a>(&'a i32);
    impl UserData for MyUserData<'_> {}

    let igood = 1;

    let lua = Lua::new();
    lua.scope(|scope| {
        let _ugood = scope.create_userdata(MyUserData(&igood)).unwrap();
        let _ubad = {
            let ibad = 42;
            scope.create_userdata(MyUserData(&ibad)).unwrap();
        };
        Ok(())
    });
}