serde/test_suite/tests/compile-fail/default-attribute/nameless_struct_fields.rs

// Copyright 2017 Serde Developers
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.

#[macro_use]
extern crate serde_derive;

#[derive(Deserialize)] //~ ERROR: 12:10: 12:21: #[serde(default)] can only be used on structs with named fields
#[serde(default)]
struct T(u8, u8);

fn main() { }