rlua 0.20.1

High level bindings to Lua 5.x
Documentation 
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use std::os::raw::c_void;

use rlua::{Function, LightUserData, Lua, RluaCompat};

#[test]
fn test_lightuserdata() {
    Lua::new().context(|lua| {
        let globals = lua.globals();
        lua.load(
            r#"
                function id(a)
                    return a
                end
            "#,
        )
        .exec()
        .unwrap();
        let res = globals
            .get::<_, Function>("id")
            .unwrap()
            .call::<_, LightUserData>(LightUserData(42 as *mut c_void))
            .unwrap();
        assert_eq!(res, LightUserData(42 as *mut c_void));
    });
}