rlua 0.14.2

High level bindings to Lua 5.3
Documentation 
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use std::os::raw::c_void;

use {Function, LightUserData, Lua};

#[test]
fn test_lightuserdata() {
    let lua = Lua::new();
    let globals = lua.globals();
    lua.exec::<()>(
        r#"
            function id(a)
                return a
            end
        "#,
        None,
    ).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));
}