auto data = Data("","","",""); assert(is(typeof(data) == Data)); assert(is(typeof(data.email) == string)); assert(is(typeof(data.username) == string)); assert(is(typeof(data.password) == string)); assert(is(typeof(data.namespace) == string)); assert(data.email == ""); assert(data.username == ""); assert(data.password == ""); assert(data.namespace == "");