src/test/run-pass/builtin-clone.rs

// Copyright 2017 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// 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.

// Test that `Clone` is correctly implemented for builtin types.
// Also test that cloning an array or a tuple is done right, i.e.
// each component is cloned.

fn test_clone<T: Clone>(arg: T) {
    let _ = arg.clone();
}

fn foo() { }

#[derive(Debug, PartialEq, Eq)]
struct S(i32);

impl Clone for S {
    fn clone(&self) -> Self {
        S(self.0 + 1)
    }
}

fn main() {
    test_clone(foo);
    test_clone([1; 56]);
    test_clone((1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1));

    let a = [S(0), S(1), S(2)];
    let b = [S(1), S(2), S(3)];
    assert_eq!(b, a.clone());

    let a = (
        (S(1), S(0)),
        (
            (S(0), S(0), S(1)),
            S(0)
        )
    );
    let b = (
        (S(2), S(1)),
        (
            (S(1), S(1), S(2)),
            S(1)
        )
    );
    assert_eq!(b, a.clone());
}