Function haproxy_api::create_async_function

pub fn create_async_function<'lua, 'callback, A, R, F, FR>(
    lua: &'lua Lua, 
    func: F
) -> Result<Function<'lua>> where
    A: FromLuaMulti<'callback>,
    R: ToLuaMulti<'callback>,
    F: 'static + Fn(&'callback Lua, A) -> FR,
    FR: 'static + Future<Output = Result<R>>,