rustc/tests/run-make/debug-assertions/debug.rs

#![feature(rustc_attrs)]
#![deny(warnings)]

use std::env;
use std::thread;

fn main() {
    let should_fail = env::args().nth(1) == Some("bad".to_string());

    assert_eq!(thread::spawn(debug_assert_eq).join().is_err(), should_fail);
    assert_eq!(thread::spawn(debug_assert).join().is_err(), should_fail);
    assert_eq!(thread::spawn(overflow).join().is_err(), should_fail);
}

fn debug_assert_eq() {
    let mut hit1 = false;
    let mut hit2 = false;
    debug_assert_eq!(
        {
            hit1 = true;
            1
        },
        {
            hit2 = true;
            2
        }
    );
    assert!(!hit1);
    assert!(!hit2);
}

fn debug_assert() {
    let mut hit = false;
    debug_assert!({
        hit = true;
        false
    });
    assert!(!hit);
}

fn overflow() {
    fn add(a: u8, b: u8) -> u8 {
        a + b
    }

    add(200u8, 200u8);
}