// Copyright 2017 Serde Developers // // Licensed under the Apache License, Version 2.0 or the MIT license // , at your // option. This file may not be copied, modified, or distributed // except according to those terms. #[macro_use] extern crate serde_derive; #[derive(Serialize)] //~ ERROR: proc-macro derive panicked #[serde(tag = "type")] //~^ HELP: #[serde(tag = "...")] cannot be used with tuple variants enum E { Tuple(u8, u8), } fn main() {}