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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use mlua::Result;

#[derive(Clone, Debug, mlua::UserData)]
struct Foo(u64);

#[mlua::userdata_impl]
impl Foo {
    #[lua(getter)]
    async fn value(&self) -> Result<u64> {
        Ok(self.0)
    }
}

fn main() {}