rust-clippy/tests/ui/needless_update.rs

// Copyright 2014-2018 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution.
//
// 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.

#![warn(clippy::needless_update)]
#![allow(clippy::no_effect)]

struct S {
    pub a: i32,
    pub b: i32,
}

fn main() {
    let base = S { a: 0, b: 0 };
    S { ..base }; // no error
    S { a: 1, ..base }; // no error
    S { a: 1, b: 1, ..base };
}