mlua 0.12.0-rc.2

High level bindings to Lua 5.5/5.4/5.3/5.2/5.1 (including LuaJIT) and Luau with async/await features and support of writing native Lua modules in Rust.
Documentation 
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#[derive(Default, mlua::UserData)]
struct Foo(Vec<u8>);

#[mlua::userdata_impl]
impl Foo {
    fn first(&self, data: &mut [u8]) -> mlua::Result<u8> {
        Ok(data[0])
    }
}

fn main() {}